Inventors at Work, with Chapters on Discovery

INDEX [45] Outlook, New York, January 7, 1905. New Domestic Architecture. American dwelling houses, whether in city or country, have within forty years been much improved in plan and equipment. To speak only of dwellings in cities, we may note how designers and inventors have promoted comfort and convenience, healthfulness and cheer. At the close of the Civil War an ordinary house in Philadelphia, or Chicago, as it left the builder’s hands was little else than a bare box. Stoves for warming and cooking had to be brought into it, wardrobes heavy and clumsy were placed beside its walls, cupboards meant to be moved and not moved easily held the raiment and table linen. In rented houses the gas fixtures might belong to the tenant; when he took them away ugly breaks appeared in walls and ceilings. To-day all this is of the past: in important details the design of the mansion is embodied in dwellings comparatively small. Furnaces for heating, ranges for cooking, form part and parcel of the building; fixtures for gas and electricity, yielding both light and heat, are provided just as water faucets are; every bedroom has its clothes closet instead of the lumbering wardrobe. In the kitchen we find dressers and china closets built into the walls; the laundry has stationary washtubs and, in some cases, a drying room as well, so that the laundress does not care should it rain on washing day. The aim throughout is that the house and its equipment shall as far as possible make up a unit, that the labor of housekeeping be minimized to the utmost by a judicious outlay of capital when the house is built. Electricity at Home. Since 1900 the American householder, as well as the American business man, has fairly awakened to what the telephone can do for him. It is estimated that in 1905 the telephone in the United States earned four times as much as the telegraph. The day is at hand when every household but the poorest will enjoy the wonderful gift of Professor Bell. In somewhat the same fashion it is dawning upon the public that electricity stands ready to perform other services, each minor, but all, in the aggregate, going far to promote health and comfort at home. At Schenectady, New York, Mr. H. W. Hillman, apart from heating in winter, has adopted electricity for many household tasks, with results described and illustrated in the Technical World, Chicago, July, 1906. His kitchen outfit for a family of five persons comprises an electric table, oven, griddle-cake cooker, meat broiler, cereal cooker, water heater, egg boiler, potato steamer, frying pan, coffee percolator, and a stove for ordinary cooking utensils. A three pound nickel plated electric iron is provided for the laundry. In the dining-room is an electric chafing dish and a percolator. On the verandah and in the den are electric cigar lighters. In the sewing-room the machine is driven by an electric motor. The bathroom has an electric mug which heats water for shaving in less than a minute; in chilly weather the luminous radiator yields just the slight heat which ensures comfort instead of discomfort. Of course, throughout the house electric lamps furnish light with the maximum of convenience and wholesomeness, the minimum of risk. How does this service compare in cost with the employment of coal and gas? With coal at $6.50 a ton, and gas at $1.30 per thousand cubic feet, the average monthly expense was formerly $6.00; with electricity the bills are but 69 cents more per month, a mere trifle in comparison with the gain in comfort, the saving of drudgery, the promotion of cleanliness. The rate for electricity used for lighting is 10 cents per kilowatt hour, for heating only half that rate. Mr. Hillman does not use electric heat for ordinary warming: it would cost him too much. A good many people are puzzled by the fact that an electric current, which yields a perfect light at a reasonable price, should in the sister task of heating fail in rivalry with a common stove or furnace. To solve this puzzle let us place our hands above a cluster of 15 Edison incandescent lamps, each of 16 candle power, representing one horse power, yet emitting no more heat than if three ounces of coal were slowly burning away in the course of an hour. This electricity may cost us ten cents an hour, the coal costs but the fifteenth part of one cent. In producing mechanical motion at a power-house, the engines waste at least ninety per cent. of the applied heat. To this heavy tax must be added the expenses of distribution, administration and maintenance. Until, therefore, the electrician reaches a mode of creating his current from heat without the enormous losses of present practice, we cannot look to him for a system of general heating. A word has already been said in this book about methods of district heating by steam. Another plan is worthy of mention. In Brooklyn the Morris Building Company supplies from a central plant fifty-two dwellings with hot water which serves not only for heating, but for cooking and washing also. The water is heated in part by live steam, in part by exhausts from steam engines. Suggested Exhibits. Such an experiment as this, the appliances at work for Mr. Hillman, suggest exhibits which might form part of the premises of agricultural colleges and technical schools. These establishments usually require for their officers such dwellings as are not too large and costly for ordinary householders. These dwellings, carefully designed and equipped, might serve as examples of the best practice in building, planning and appointment; in sound methods of heating from a central plant. At suitable times they might be open to public inspection. They might range in cost from $1,000 to $5,000, the cheapest to be built of wood, others to be built in brick, stone, or concrete. All the furniture and fittings to be chosen with an eye to wholesomeness, durability, and maintenance with the least labor possible. Each house should contain in its main room a card telling the cost of the building, with estimates of cost if executed in other materials. On occasion this plan might be extended to the contents of houses, each item on show days to be duly labeled. A series of such houses would tend to bring ordinary house-planning and housekeeping to the level of the best. Many books and journals offer architectural diagrams which few can understand, but everybody can see how attractive a good plan is when realized in a house to which he pays a leisurely visit. At Expositions, such as those of Chicago and St. Louis, the appeal of the architect and the exhibitor is rather to wonder than to utility. He shows us schlosses from Germany, palaces from Italy, châteaux from France, all appointed with costly magnificence. But while the average American wage is eleven dollars a week these displays can do little good as models for imitation. NOTE ON THE LITERATURE OF INVENTION AND DISCOVERY Books on invention and discovery are mentioned here and there throughout this volume. The reader may wish further references, in which case he may find them at the public library nearest home. Within the past few years the public libraries of America have been laying stress on their educational departments, are becoming more and more a worthy complement to the public schools. At the Carnegie Library, Pittsburg, the department of technology is directed by Mr. Harrison W. Craver, a graduate of a polytechnical institute, who has had experience as a practicing chemist. The collection keeps mainly to lines of local interest, and includes an ample array of trade journals. Indexes to articles in technical journals are maintained. On the shelves are files of patents of the leading nations of the world. Short lists of books on subjects of current interest are from time to time compiled and issued. Workers receive advice and personal assistance from scientifically trained men. Questions are answered by mail and telephone. Notes on books are appended to their titles on the catalogue cards, and in the monthly bulletin. Mr. Craver’s aid extends to other public libraries, among them to that at Providence. Here the industrial department contains about 7600 volumes, chiefly devoted to the principal industries of the city,—textiles, electrical arts, machinery, and the arts of design, especially in jewelry. A room is at the service of draughtsmen: a dark closet is available for copyists who bring cameras. When a new book comes in the reader or the artist likely to want it is notified. The Pratt Institute Free Library, Brooklyn, has an applied science reference room which receives 115 scientific, technical and trade journals. It has brought together a large collection of trade catalogues, duly classified, and a collection of cuts of machines and mechanical devices. The custodian makes it his business to visit the neighboring factories and workshops, so as to provide every publication likely to be of help. The use of this department increases steadily, with a marked effect on the proportion of scientific books taken from the general library for home reading. Newark, a city of many and diverse manufactures, has a public library also of the first rank. Scientific books, as received, are brought to public attention through the press, and by means of the monthly bulletin mailed to any one on request. Short lists of selected works on particular branches of applied science are prepared for gratuitous distribution: in each book of a series the full list is pasted as a guide to extended reading. Readers are invited to ask for any book not in the library which they believe would be of service to them. These are but a few examples of the work the public libraries are doing throughout the Union. At the headquarters of the American Library Association are issued manifold aids for readers and students: a list of them is given on a page following the index to this book. Let us hope that one of these days the Association may establish a bureau through which the literature of applied science, and all other worthy literature, may be passed upon by a staff of the best critics, for the behoof of all the people. Such a service would inure not only to the good of those who borrow books from public libraries, but would afford help to the men and women who buy books for libraries of their own. INDEX Abbe, Ernst, portrait, facing 182 ; Jena glass, 181 ; at first ignorant of practical optics, 293 . Aboriginal art, National Museum, Washington, 106 ; tools, 89 . Abrasion, manganese steel resists, 171 . Accident, Nobel profits by an, 411 . Accidental observation, 289 . Acheson, E. G., carborundum, 101 . Achromatism, Newton on, 254 . Acknowledgments, xxi . Actinium, four derivatives, 200 . Adams, Frank D., proves marble plastic, 196 . Adams, John Couch, discovers Neptune, 378 . Aeronautics, 129 . Air, compressed. See Compressed air ; brake catechism, R. H. Blackall, 428 ; chamber of pumps, 252 ; churned in telescopic tube, 348 ; compressors, 424-427 ; and multiple cylinders for, 372 ; turbines, reversed as, 372 ; conducting when traversed by X-ray, 282 ; warm, and smoke protect from lightning, 294 ; hardening steel, 172 ; jet for machine tools, 173 . Aladdin oven, 189 , 190 . Alchemy and radio-activity, 203 . Alcohol, cheap, 452 ; engines, 468 ; for lighting, 157 ; lamp with hood, 158 . Algonquin art, 115 . Allan Line steamers driven by turbines, 455 , 456 . Allen, Leicester, on invention, 268 . Allis-Chalmers steam engines, facing 448 , facing 452 ; Francis vertical turbine, 446 . Alloy for electro-magnets, 173 . Alloys, influence of minute admixtures, 175 ; made by pressure, W. Spring, 201 ; Weston’s for electrical measurers, 232 , 234 ; anti-friction, 174 . Alternating currents used as produced, 346 . Alum crystal broken and repaired, 193 , 194 . Aluminium discovered by Wohler, 143 ; properties, 143 , 144 , 145 ; separated from its compounds by C. M. Hall; uses, 144 , 145 ; in lithography, 144 ; in producing great heat, 145 ; alloys, 145 ; as electrical conductor, 145 ; in iron manufacture, 145 ; mandolin pressed, 185 . Alundum wheels, 101 . American Library Association, aids to readers and students, 487 . Ammeter, Weston’s, 233 . Ammonia sulphate from Mond plant, 461 . Analogy as a guide, 366-369 . Anderson, Sir William, on formulae, 383 . Andrews’ discovery of continuity in states of matter, 212 . Angles replaced by curves, 48-51 . Animal frame repeated in machinery, 250 . Annealing steel, 168 . Annular drills, 91-93 . Anthony, W. A., on invention, 268 . Anti-friction alloys, 174 . Ants, Warrior, nest, 260 . Aquarium, New York, 76 . Arbor hollow, cooled, 88 . Arc-lamp, 160 ; inverted, 75 , 76 . Arch, its structural advantage, 42 ; discussed by W. P. P. Longfellow, 43 ; as dam, 45 ; of skull, 250 ; Saracenic, 43 ; bridge, Niagara, 31 . Arches inverted as gulleys, and anchorage, 45 ; pointed, 43 ; united as dome, 355 . Architecture, Egyptian, 114 ; Japanese, Ralph Adams Cram, 114 , foot-note; materials, 115 ; modern, Russell Sturgis on, 119 ; new domestic, 483 . Areas, irregular, measured, 347 . Argon discovered by Lord Rayleigh, 213 . Arm holding ball, 256 . Arrows, feathers in, 65 . Articulated water-pipe, 259 . Ashes, conveyors for, 447 . Astatic needles, 149 . Astronomy advanced by new instruments, 230 ; aided by Carnegie Institution, 277 ; co-operation in, E. C. Pickering, 278 ; measurements in, 229 , 230 . Atkinson, Edward, Aladdin oven, 189 ; on window glass, 72 ; “Science of nutrition,” 190; tendencies in manufacturing, 480, foot-note . Atmosphere, gases of, 213 , 214 . Atom, size, 130-32 . Atwater, W. O., on foods, 243 ; on energy value of foods, 264 ; aided for researches on foods, 277 . Austenite, 164 . Automatic devices, 329-337 ; at Interborough Power-house, 447 ; stokers, 450 . Automobile design, 117 ; gasoline driven, construction, 468 ; balanced cylinders, 464 ; racing, 66 ; radiator, 87 . Axe tells story, Wm. Metcalf, 377 . Axles, hollow, 40 ; cooled, 88 . Baboons teach Hottentots and Bushmen, 136 , 259 . Bain, Alexander, on identifying faculty, 360 ; on passion for experiment, 304 ; on sound judgment, 385 . Balance, beginnings, 208 ; ancient Egyptian, 219 , 220 ; Lavoisier, 209 ; interferometer applied to, 217 ; measures irregular areas, 347 ; requirements for, 220 ; at its best, 221 . Balance wheel in time-pieces, 222 ; Earnshaw’s compensated, 223 . Balances, Bureau of Standards, 235 . Bale, Geo. R., Modern Foundry practice, 176 . Ball-and-socket joints, 251 . Ball bearings, 47 , 48 . “Baltic,” steamer, 127 . Baltimore truss, 25 . Bamboo, its uses, 141 ; for walls and roofs, 39 ; for water carriage, 45 ; filament for electric lamp, 140 . Bank-swallow, lesson from, 297 . Bar of metal shaped by pressure, 326 ; for reinforcing concrete, 436 , 437 . Bark vessel and clay derivative, 115 . Barnard, E. E., detects a double star, 285 . Barrel pressed steel, 185 . Barrett, W. F., experiments with iron alloys, 173 . Basin, experimental, for ship models, 54 , 55 ; U. S. Navy, facing 54 . Baskerville, Charles, researches in thorium, 200 . Basket, Bilhoola, 110 , 111 ; Pomo, 109 ; bowl, Yokut, 112 . Baskets imitated from fish traps, 116 ; materials for, 109 ; waterproof, 143 . Basketry, materials for, 142 ; Indian, Otis T. Mason, 110 , 142 . Bates, W. H., explains protective resemblances, 289 . Bearings, ball, 47 , 48 ; roller, 47 , 49 . Beaufoy, Marc, on ship resistances, 52 . Beauty through use, 104 , 105 . Beaver dams, ingenuity of, 265 ; tooth, 258 . Becquerel, Henri, researches in phosphorescence, 199 . Beethoven composing, 300 . Begonia, tuberous, produced, 249 . Bell, Alexander Graham, portrait frontispiece , facing 2 , his Brantford homestead; transmission of sound by light, 393-400 ; telephone, 393, foot-note , 293 . Bell, Sir I. L., manufacture iron and steel, 177 . Bell, Louis, “Art of Illumination”, 229, foot-note . Bergman, Torbern, analyzes steel, 163 . Bessemer, Henry, portrait facing 402 ; early tasks, makes bronze powders, 401 ; improves sugar-cane mill, 402 ; begins experiments with iron, 403 ; first converter, 404 ; illustrated, 406 ; pulverizes materials for glass, 407 ; on “a little knowledge,” 408 ; improves the drying of oils, 409 ; process, 164 ; steel rails, 14 . Bicycle wheel, 382 . Bi-focal spectacles, 85 . Bilgram, Hugo, gearing, 67 . Binding machinery, direct, 342 . Binocular glasses, 81 , 82 . Biological observations, Karl Pearson on, 277 ; laboratories, 276 . Birch-bark vessels, 115 . Bird’s feet covered with dirt observed by Darwin, 280 . Bilhoola basket, 110 , 111 . Birds and reptiles, a link discovered by E. S. Morse, 287 ; flight of, studied, 263 . Bismuth pure and united with tellurium, 175 . Blackall, R. H., air-brake catechism, 428 . Blanchard lathe, 95-97 . Blast furnaces curved, 50 ; gases for power, 462 . Blasting, its utility, 411 . Blenkinsop’s locomotive, 345 . Bliss press work, 184-186 ; forming die, 184 ; gears, 67 . Blocks, hollow concrete, 433-435 . Blood, circulation of, 256 ; pressure, experiments on, 272 . Blowing machinery, Homestead, Pa., 415 . Boat, canal, diminishes in resistance when quickened, 283 . Boiler corrugated, 88 ; economy, 450 ; outside furnace, 381 ; plate cut, 91 ; copper, how improved or worsened, 176 . Boiling point water lowered as atmospheric pressure lessens, 375 . Boivin burner for alcohol, 157 . Bolometer, Langley’s, 225 . Bookcases, sectional, 351 . Book-shelves with camber, laden and unladen, 36 , 37 , 254 . Books reproduced by photography, 324 . Borderlands of knowledge, Lord Rayleigh on, 275 . Bourne, George, on beauty of tools, 105 . Bow-puller studied by E. S. Morse, 288 . Bowstring bridge, 31 ; Philadelphia, 32 ; invented by Alex. Nasmyth, 308 . Brace, ratchet bit, 90 . Brachiopods studied by E. S. Morse, 288 . Brahe, Tycho, observations, 229 . Brain in co-ordination, 257 ; disease, localization, 378 ; disease treated, 272 . Brakes, Westinghouse, 428 . Bramah, planer, 98 . Brashear, J. A., concave plates for Rowland, 237 ; optical surfaces produced, 83 , 84 ; lenses and mirrors for interferometer, 217 . Breakwaters curved, 51 ; concrete, 430 . Breech-loader, 379 . Bricks shaped by pressure, 325 . Brick-work outlines, 112 . Bridge, concrete, at St. Denis, 431 ; Forest Park, St. Louis, 444 ; Memorial, Washington, D. C., 444 ; continuous girder, 32 , 34 ; deck, 24 ; pipe-arch, Rock Creek, 41 ; and at Saxonville, Mass., 41 , 42 ; Plauen, Germany, 42 , 43 ; rollers, 38 ; St. Louis, 31 ; strains studied, 25 ; through, 24 ; Victoria, Montreal, 26-28 ; Whipple, 25 . Bridges, 18-38 ; cantilever, 26 ; near Quebec, 29 , 30 ; Kentucky river, 30 , 31 ; esthetic designs, 38 ; railroad, 23 ; suspension, 32 . Bronze powders, Bessemer’s, 401 . Browne, Addison, on original research, 273 . Brush, Charles F., arc-lamp, 160 . Bubbles rising in liquid, 127 , 128 ; sharpen files, 147 . Buchanan, William, plans famous engine, 15 . Buffalo trails give hints to railroad engineers, 259 . Buffon on invention, 271 . Bullock cart with solid wheels, 47 . Bulrush section, 251 . Bureau of Ethnology reports, 107, foot-note . Bureau of Standards, Washington, 234-236 . Burke, Charles G., telegraphic code, 352 , 353 ; simplified signals, 354 . Burner, Boivin, for alcohol, 157 . Burroughs, John, on observation, 281 . Bushmen learn from baboons, 136 . Buttresses for arches, 43 . Cabin, disadvantages of its size, 130 . Cables, electric, X-rays examine, 327 . Cactus adapts itself to environment, 248 . Cadmium rays, 218 . Caliper, micrometer, 236 . Camber in book-shelves, 36 , 37 , 254 ; in bridges, 37 . Campbell, H. H., Manufacture iron and steel, 177 . Canada, roofs in, 118 , 119 . Canal and circulation blood, 256 ; boat diminishes in resistance when quickened, 282 . Candles copied in gas-burners, 116 ; and in electric lamps, 117 . Cantilever, 26 ; bridges, 26-31 ; where best, 35 . Capital more necessary under factory system than before, 480 . Carbon dioxide detected in flue gases, 470 . Carbon in steel, 163 , 164 ; filament graphitized, 158 . Carborundum wheels, 101 , 102 . Carburetor, 466 . Cards for catalogues, 349 , for notes, 350 . Carex root in basketry, 110 , 143 . Cargo steamer, 59 , 61 . Carnegie Institution for Original Research, 276-278 ; Library, Pittsburg, 486 . Carpenter, Rolla C., “Heating and ventilating buildings,” 472 . Cartilage in joints, 251 . Carving chisels and gouges, 90 ; by air hammers, 418 . Catenary curve, 43 . Cathode rays, 198 . Cattle-breeding, 249 . Caves as store-houses, 137 ; Virginia and Kentucky, 123 , 246 . Cedar for basketry, 110 , 142 . Ceiling, heating coils on, 86 ; white, as reflector, 76 . Cellulose filaments for lamps, 261 . Celts lend forms to bronze, 116 . Cement, natural, 430 ; Portland, 430 ; Roman, 429 . Cementite, 164 . Central stations, telephonic, 257 ; management, Edison Electric Co., Brooklyn, 474 . Centralization, tendencies, 481 . Cerium for gas mantle, 156 . Chain suspended, 43 , 44 . Chaldean records of eclipses, 229 . Channeling machine, Saunders, 342 . Chanute, Octave, on invention, 268 . Character in research, Tyndall on, 364 . Charcoal, 125 ; produces vacuum, 328 . Chemical synthesis, 374 ; theory enlarged by discovery of radio-activity, 203 ; triggers, 337 . Chemistry of living bodies, 262 . Chimneys, why shorter, 448 ; reinforced concrete, 440 , 441 . Chisel, carving, 90 ; cold, of two kinds steel, 167 . Chittenden, L. E., lesson from bank-swallow, 297 . Church, Duane H., inventor watch-making machines, 222 . Church of St. Remy, 43 ; Notre Dame de Bonsecours, Montreal, 118 . Cinders, large and small on hearth, 120 . Cities, why they gain at expense of country, 478 ; sites for, 246 . “Class in Geometry,” 122 . Classification literature, Melvil Dewey, 352 . Clay, molded, 102 , 103 ; in the arts, 139 . Cleveland Stone Co., compressed air plant, 427 . Clifton suspension bridge, anchorage, 45 . Clipper ships, 57 . Cloaca Maxima, Rome, 45 . Clocks, Riefler, 223 , 224 ; self-winding, 330 . Coal, glowing, broken into fragments, 120 ; cutter, Ingersoll, 418 ; testing plant, U. S. Geological Survey, foot-note, 241 ; washer, 151 . Cobbett, William, on writing as an exciter of thought, 300 . Coding in telegraphy, 352-354 ; in invention, 317 . Coherer, origin of, 147 . Coignet netting for concrete, 442 . Coils, heating, 86 . Collections, value of, 288 . Collodion, Nobel utilizes, 411 . Color dispersion, 180 . Columns of bridge, 23 ; hollow, 39 . Combinability of matter, 194 . Compass deflected by electricity, 230 , 231 , 290 . Compasses as truss model, 20 ; liquid, 149 . Compensating devices, 148 . Complexity in machine may be necessary, 341 . Compressed air, 417-428 ; drives tools, 417 ; coal cutter, 418 ; for hammers, facing 418 , 419 ; air tools first used by dentists, 419 ; drill used as hammer, wood-borer, 420 ; ramming, paving, tamping, 420 ; drives away chips, cools cutter, lifts water, 421 ; works pumps; for painting, 422 , 423 ; for cleansing, 423 ; sandblast, 424 , 425 ; air compressors, 424-427 ; inter- and outer-cooler, 426 ; heaters for, 426 ; in quarrying, 427 ; Westinghouse brakes and signals, 428 ; for transmitting power, 348 . Compression in building, 8 ; members must be of rigid material, 19 . Compressors, air, 424-427 ; Parsons‘, 372 . Conch-shells as pitchers, 108 . Concrete and its reinforcement, 429-445 ; vast uses concrete, 431 ; bridge at St. Denis; desirable qualities, 431 ; silos, 431 , 432 ; residence, Fort Thomas, Ky., 432 and facing 432 ; for small, cheap dwellings, 432 ; blocks, general manufacture, 433 , 434 ; reinforcement introduced by Monier, 435 ; bars for, 436 , 437 ; Monier netting; expanded metal, 437 , 438 ; molds, 438 ; Pugh Building, Cincinnati, grain elevators, bins, 439 ; chimneys, incorrodibility, 440 , 441 ; tanks, reservoirs, 441 , 442 ; Coignet netting, 442 ; conduit, water-pipes, 442 ; culvert, N. Y. Subway, 443 ; bridges, 443-445 ; strengthened by crushed stone, 240 ; “Concrete Construction about the Home and on the Farm,” 431, foot-note . Condensers, steam engines, 87 ; Weighton’s, 452 . Conduit, reinforced concrete, 442 . Cones, similar, vary in contents as cube of like dimensions, 376 . Confectioners’ ornaments, 325 . Contents, solid, ascertained, 343 , 344 . Continuous girder bridge, 32 , 34 . Contours as decided by material, 111 . Contraction withstood, 88 . Contraries, profit in, 379 . Convenience in machines, 106 . Converse inventions, 70 . Conveyors, 69 . Cook, O. F., on interest as prime factor in discovery, 306 . Cooking box, Norwegian, 189 . Co-ordination, brain, 257 ; machinery, research, in armies, 194 . Copernicus as discoverer, 270 , 359 . Copper in electric bath, 103 ; reduced in electrical conductivity by admixtures, 175 ; for boilers, affected by union with antimony, arsenic, bismuth, 176 . Corals fed, 123 . Corona observed, 293 . Corrodibility, slight, of Jena glass, 183 ; of steel reduced, 167 ; of steel in concrete, 441 . Corrugated boiler, fire-boxes, 88 . Cotton seed utilized, 149 . Counterbalance, hydraulic pressure, 371 . Cowpox prevents smallpox, 295 . Cram, Ralph Adams, on Japanese wood-work, 113 ; “Japanese Architecture,” 114, foot-note . Craver, Harrison W., Carnegie Library, Pittsburg, 486 . Crookes, Sir W., on precise measurement, 214 ; tube, 198 ; radiometer modified by Nichols, 226 . Cross-fertilization of sciences, Maxwell, 275 . Cross-ties introduced on railroads, 13 ; steel, Pittsburg, 17 . Croton Dam, concrete, 431 . Crow gets at clam, 369 . Crystal, alum, broken and repaired, 193 , 194 , 357 . Crystallization iron and steel, J. W. Mellor, 177 . Cube subdivided, 121 , 122 ; root extractor, 375 , 376 . Cubit, origin, 209 . Culvert, reinforced concrete, 443 . Cunard steamers, new, 128 ; driven by turbines, 456 . Curie, Pierre, and wife, discover radium, 199 . Curves replace angles, 48-51 . Cushing, F. H., on Zuni water vessels, 108 . Cutters, lathe, 90 ; milling, 98 , 100 , 101 . Cylinder, hollow, for piping, 45 ; for boilers, 46 ; strength of, in organic forms, 250 , 251 . Cypress, deciduous, 247 , 248 . Dacotah fire-drill, 94 . Daguerre’s discovery of photography, 304 , 305 . Dam in arched form, 45 ; across Bear Valley, 44 . Darwin, Charles, as observer, 280 ; as questioner, 356 ; facts and arguments, 359 ; on directive worth of theory, 356 . Davenport, C. B., experimental evolution, 276 . Da Vinci, Leonardo, artist and inventor, 308 ; suspended wheel, 382 . Dawson, Bernard, open hearth furnace, 164 , 165 . Dayton, Ohio, as center interurban electric lines, 482 . Deck bridge, 24 . De Laval, steam turbine, 452 , 453 . Delta metal, Alex. Dick, 325 . Dentists first to use air tools, 419 . De Rochas, Beau, gas engine, 462 . Detachable parts of tools and so on, 239 . De Vries, Hugo, discovers evolution by leaps, 276 . Dewar, James, non-conducting glass vessels, 375 ; produces vacuum, 327 . Dewey, Melvil, decimal classification literature, 352 . Dexter feeding mechanism, 331 . Diamond, combustibility of, 357 ; artificial, H. Moissan, 265 ; drills, 92 ; separated from other stones, 150 . Dick, Alex., inventor Delta metal, 325 . Dies, steel, 175 . Diesel oil engine, 466 . Diffusion of constituents air, 262 . Digestion, impaired, treated with lining of ostrich stomach, 295 . Digit as measure, 209 . Directive paths, 332 . Directness as an aim in design, 342 . Directory iron and steel works, J. M. Swank, 178 . Discovery, character in, 364 ; chief impulse to, 306 ; method of, 300 ; Faraday on, 363 , 364 ; Jevons on, 364 . Discursiveness, Thomas Young, 365 . Disease, functional, 378 ; skin, treated with Uviol lamp, 183 ; brain, localization, 378 . Dispersion of color, 180 . Distribution motive power, direct, 342 . District heating by steam, 448 ; Lockport, N. Y., advantages, 473 ; by water, 485 . Division of labor modified, 480 . Dodge & Day effect economies, 244 . Dogmatism, Tyndall, 363 . Dollond lenses, 254 , 255 . Dome built of arches, 355 ; of ants’ nest, 260 . Domestic architecture, new, 483 . Douglas, James, on automatic machinery in metallurgy, 332 . Downdraft furnace, 381 . Dowson producer gas for lightning, 157 . Draft, mechanical, 380 , 448 , 472 . Drama, nature as, 356 . Drawing, James Nasmyth on, 308 . Dredges, hydraulic, 259 . Drill, diamond, 92 ; fire, Dacotah, 94 ; steels, 418 ; air, used as hammer, 420 . Drills in rifle-making, 282 ; multiple, 290 ; ring, 91-93 ; twist, 93 . Drilling in lathe, two methods, 370 . Drucklieb, C., sandblast, 424 , 425 . Drummond, Thomas, lime-light, 155 . Dry blast process, Gayley, 165 . Dudley, C. B., anti-friction alloys, 175 . Dudley, Plimmon H., portrait, facing 14 ; forms of rails, 14 ; on steel for rails, 169 . Dulong and Petit, non-conducting glass vessels, 375 . Duncan, R. K., “The New Knowledge,” 204, foot-note . Dundonald, Lord, gas flame, 280 ; down-draft furnace, 381 . Durand, W. F., on ships varying in size, 128 . Dust, 125 ; combustible, 125 . Dvorak sound-mill, 132 . Dwellings, suggested exhibits, 485 . Dyes tested with Uviol lamp, 183 . Dynamite invented by Nobel, 410 . Eads, J. B., Mississippi jetties, 283 ; St. Louis bridge, 31 , 41 , 127 . Ear structure, 257 . Earnshaw’s compensated balance wheel, 223 . Earth, age of, 356 ; sculpture, 122 . Eclipses, Chaldeans observed, 229 . Economizer, steam engine, 449 . Economy, aim in invention, 341 ; tested by experience, 383 . Edison, portrait, facing 374 ; as an organizer, 414 ; bamboo filament, 140 ; incandescent lamp, 158 ; on concrete for cheap dwellings, 432 ; separates iron from sand, 150 ; storage cell, 374 ; store-house, 153 ; tells how he invented phonograph, 310 ; latest phonograph, 312 . Education of eyes, ears and hands, 300 . Eel, electric, 257 . Egyptian architecture, 114 . Elasticity explained, 358 . Electric cables, X-rays examine, 327 ; conductors and non-conductors, 202 ; dynamo and its converse, the motor, 373 ; eel, 257 ; heat for cooking, 188 ; heat, why too dear for ordinary warming, 484 ; heater, Gold’s, 87 ; lamps in candle shapes, 117 ; lighting, 158-162 ; lighting, General Electric Co.‘s researches, 416 ; lighting current economized by uniform voltage, 243 ; locomotive, General Electric Co., 128 , 129 , 415 , 476 , facing 476 ; motor aids handicraftsmen, 481 ; traction, 476 ; interurban, 482 . Electrical advances, Lord Rayleigh on, 274 ; conductor, copper as, affected by admixtures, 175 ; conductor, iron as, 173 ; contact, imperfect, leads to invention of microphone and coherer, 146 ; experiments, Faraday’s simple, 391 ; reversibility, 373 ; sparks useful, 147 ; Testing Laboratories, N. Y., 242 ; thermometry, 225 , 226 ; units adopted, 239 . Electricity for all possible services, 474 ; in the household, 484 ; for power transmission, 348 ; may be produced by food, 264 ; measured, 230-234 ; measures heat, 373 ; modifies properties, 140 ; brings new properties into view, 197 ; used as produced, 346 . Electrolysis and its converse, 373 , 374 . Electro-magnetism discovered by Oersted, 230 , 290 , 373 . Electro-magnets curved, 50 ; alloy for, 173 . Electro-plating and its converse, 374 . Electrons, Joseph J. Thomson on, 132 ; form cathode rays, and parts of atoms, 198 . Elements of chemist probably a single substance, 357 . Elevator cages, 40 ; grain, 68 ; reinforced concrete, 439 . Elliptical hand-hole plates, 46 . Embossing machines curved, 50 . Embroidery machine, 319 . Emery testing apparatus, 242 . Emery wheels, 101 , 102 . Energy, molecule as reservoir of, 131 ; potential, 358 . Engineering problems, Osborne Reynolds on, 274 ; principles in vegetation, 247 . Entrance of ships, 53 . Ericsson, John, inventive from childhood, 303 ; Life, 98 ; Monitor, 97 , 98 . Erie City boiler, 46 . Eskimo ingenuity, 106 ; pelts and bird-skins, 138 ; skin scraper, 91 . Esthetic design of bridges, D. A. Molitor, 38 . Ether may give birth to matter, 358 . Ethnology, Bureau of, reports, 107, foot-note . Everett, Harold A., acknowledgment to, 64 . Evolution proved by Darwin and Wallace, 267 ; chemical elements, and of stars, 204 ; the master key, 357 ; experimental, 276 . Ewart detachable link belting, 69 . Exhibits of dwellings suggested, 485 . Expanded steel, 437 , 438 . Expansion withstood, 88 . Experiment, 299-328 ; passion for, Bain on, 304 . Experimental evolution, 276 . Explanation, the longing for, 355 . Explosions, retarded effects, 195 . Explosives, utility of, 409 , 411 . Eye structure, 257 ; and Dollond lenses, 254 , 255 . Faber talking machine, 343 . Factory system, rise of, 479 ; checks to, 480 . Faculty, identifying, 360 ; knitting, 359 . Fan blower, converse of windmill, 371 ; for furnaces, 372 ; for pneumatic tubes, 373 ; for heating and ventilating, 380 , 472 ; screw form, 69 . Fanning mill, 150 . Fansler, Percival E., acknowledgment to, xxi . Fant, Thomas E., acknowledgment, xxi . Faraday as an observer, 279 ; discovery magneto-electricity, 373 ; discovery specific inductive capacity, 212 ; magnetic researches, 201 ; on discovery, 363 , 364 ; on observations of untrained men, 294 ; on radiant matter, 204-206 ; method of working, 389 ; on experiment, 390 ; simple apparatus for experiment, 390 ; orderliness, 391 ; imagines lines of force, 392 . Farm implements should be simple, 340 . Fathom, origin, 209 . Feathers have advanced birds in scale of life, 250 ; in arrows, 65 . Feeding mechanism, Dexter, 331 . Fellows gear shaper, 67 . Ferguson, Mephan, water-pipe, 45 . Ferrite, 164 . Ferro-titanium arc-lamp, 161 . Fibre, indurated, 322 . Filaments for incandescent lamps, 261 . Files sharpened by bubbles, 147 . Fire kindling, 125 ; modifies properties, 140 ; brings properties into view, 197 . Fire-arms rifled, 65 . Fire-boxes, Morison corrugated, 88 . Fire-drill, Dacotah, 94 . Fire-fly, Cuban, 263 . Fire-lighter, spiral, 41 , 42 . Fire-syringe, 467 . Fischer, L. A., acknowledgment to, xxi . Fishing-rod, in steel tubing, 41 . Flaming arc-lamp, 160 . Flesh frozen for slicing, 326 . Flight, mechanical, 262 . Flint, aboriginal, 89 ; for tools and weapons, 137 ; polished by sand, 424 ; burnt for white ware, 290 . Flour milling, Hungarian, 150 . Flywheel encased to lessen air resistance, 67 . Folk observation, 294-297 . Food, how chosen, 135 , 136 ; energy value of, 264 ; investigated by W. O. Atwater, 243 ; with aid from Carnegie Institution, 277 . Foot measure, origin, 209 ; skeleton, 250 . Foresight in invention, 265 . Form, 5-119 ; conferred, 103 , 104 ; in plastic arts, 103 ; to lessen resistance to motion, 65-71 . Fortifications, curves in, 51 . Foster, Sir Michael, on original research in medicine, 269 . Foundries, iron, list, last paragraph, 178 . Foundry practice, modern, Geo. R. Bale, 176 ; compressed air in, 420 . Francis vertical turbine, 446 . Franklin, Benjamin, bi-focal spectacles, 85 ; stove, 85 ; proves lightning to be electricity, 360 . Fraunhofer invents spectroscope, 284 . Freeman-Mitford, “Bamboo Garden,” quoted, 141 . Freezing earth to stop leak, 326 ; water expands, 375 . Friction, Beauchamp Towers’ researches, 274 ; alloys for minimizing, 174 . Frost wedges off stone, 123 . Froude, Edmund, on ship resistances, 53 . Fuels which serve gas engines better than steam engines, 466 . Furnace inside boiler, 381 ; downdraft, 381 . Furniture embodied with house, 483 ; lumber for, bent and seasoned at once, 343 . Galileo invents pendulum, 222 . Gallows-pipe, 86 . Galton, Francis, on sharp sight and visual memory, 281 . Galvanometer, Maxwell’s, Kelvin’s, 231 . Gang saws, 290 . Garden squirt, 371 . Gas exploded by electric spark, 147 ; from a candle, 457 , 458 ; engines, 458 , 462-466 ; producer, 459-461 ; Mond gas, 461 ; blast furnace, 462 ; for heat, light and power, 475 ; grates imitate maple or charcoal, 117 ; lighting, 154 , 155 , 280 , 457 ; mantle, 155-59 ; producer, Loomis, 382 ; Taylor, 460 ; turbine projected, 415 . Gases, kinetic theory of, 357 ; of the atmosphere, Sir W. Ramsay, 214, foot-note . Gasoline engines, 468 . Gayley dry blast process, 165 . Gearing, 67 . Geissler tubes, 198 . General Electric Co., locomotive, 415 , 476 , facing 476 ; researches in lighting, 416 . Generalization in discovery, 306 ; Simon Newcomb on need of, 277 . Geological studies aided by Carnegie Institution, 277 ; Survey, U. S., coal testing plant, 241, foot-note . Geology, elementary, 122 , 123 ; records of, 377 ; study of, 356 . Geometry, Class in, 122 . Germany leads in original research, 275 . Germs destroyed with Uviol lamps, 183 . Giffard injector, 347 . Gill, Sir David, on double star discovery and measurement, 286 . Girders, 10-12 ; box, 39 ; Hennebique concrete, 437 . Glacial action observed, 294 ; Darwin fails to observe, 280 . Glanz-stoff, artificial silk, 261 . Glass, binocular, 81 , 82 ; Jena, see Jena ; nickel steel of equal expansibility with, when heated, 170 ; prismatic and ribbed, 73 , 74 ; rough, for windows, 72 ; total reflection, 77-82 ; making, Bessemer pulverizes materials for, 407 . Gledhill, J. M., on high-speed tool steels, 172 . Globes, Holophane, 78-81 . Gluttony, Indian, a cause, 137 . Glycerine utilized, 149 . Gold betokened by a bush, 296 ; extraction of, 332 ; solid, diffuses in solid lead, 201 ; alloyed with bismuth has no tenacity, 175 . Gold’s electric heater, 87 . Goldschmidt, Dr., produces great heat from iron oxide and aluminium, 145 . Goodyear, C., discovers vulcanization of rubber, 289 . Gothic cathedrals, 43 . Gouges, carving, 90 . Gourd as pitcher, 108 ; derived pottery forms, 109 . Graham, Thomas, on states of matter, 201 . Grain dried for keeping, 137 ; elevator, 68 ; separated from chaff, 150 . Graphitized carbon filament, 158 . Gravitation, law of, Newton’s discovery, 387 . Gravity as motor in mills and post-offices, 321 , 322 ; balanced, 148 ; brings rain to valley, 245 ; specific, learned, 344 . Gray, Elisha, telautograph, 315 . Greek sculpture, 114 . Gribeauval, Gen., interchangeability, 238 . Griffin, Charles, on convenience in machines, 106 . Grinding lenses, 83 , 84 . Guesses precede theories, 358 . Guillaume, C. E., invents invar, 169 ; his unit of measurement, 213 . Gun, built-up, 252 , 253 ; breech-loading, 379 ; curved, 50 ; drilled, 93 . Gunpowder cakes, 125 . Guthe, K. E., steatite fibres, 235 . Hadfield, R. A., alloy for electro-magnets, 173 ; manganese steel, 171 . Haida squaw mats, 116 . Haitinger, Ludwig, discovers cerium in gas-mantle, 156 . Hall, Asaph, discovers two satellites of Mars, 286 . Hall, Charles M., produces aluminium, 143 . Hall, F. W., mechanical treatment steel (see under Harbord ), 177 . Halsey, T. S., on premium plans for wages, 244, foot-note . Hammer, air, 419 ; drill used as, 420 ; wasp using pebble as, 260 . Hand-breadth as measure, 209 . Hand-hole plates, Erie City boiler, 46 . Handicrafts revived, 481 . Handwork should not be directly imitated in machine design, 342 . Harbord, F. W., Metallurgy of steel, 177 . Harcourt lamp, using pentane, 226 . Harcourt, Rev. Vernon, makes new glass, 181 . Hargreaves, James, invents spinning jenny, 290 . Harris compressed-air pump, 422 . Harris rotary press, 48 . Harrow simple, 340 . Harvester, self-binding, 478 . Harvey, discovery movements heart and blood, 267 , 272 , 359 . Haymaking and law of size, 130 . Heart and built-up gun, 252 , 253 . Heat, as motion, 358 ; conservation of, 250 ; converted into work, 263 ; economy, 85 , 86 ; electric, for cooking, 188 ; light and motive power from central stations, 473-474 , 481 ; measured by electricity, 373 ; non-conductors, 186-188 , 190 ; treatment of steel, 167 ; withstood by Jena glass, 183 . Heater, Gold’s electric, 87 . Heating and power production united, 471 ; ventilating, and Sturtevant methods, 380 , 472 ; coils, 86 ; district, by steam, 448 ; by water, Morris Building Co., Brooklyn, 485 . Hefner unit of illumination, 226 . Helium, density, 213 ; in sun, in minerals, may be a constituent of chemical elements, 202 . Helmholtz ophthalmoscope, 321 . Herkomer, Hubert, direct reproduction, 342 . Herschel, resources of, 305 . Heusler, F., magnetic alloys of non-magnetic elements, 173 . Hewitt mercury-vapor lamp, 161 ; Jena glass for, 183 . Hides prepared for use, 138 . Hillman, H. W., household uses electricity, 484 . Hip joint section, 252 . Holloway, J. F., supports turbine by upward pressure water, 371 . Holmes, W. H., Art in shell of the Ancient Americans, 116 ; form and ornament in ceramic art, 111 , 115 ; Pottery of the Ancient Pueblos, 108 , 109 . Holophane globes, 78-81 , 229 . Homestead blowing machinery, 415 . Hood, ventilating, for alcohol lamp, 158 . Hooke’s universal joint, 256 . “Hopes and fears for art,” Wm. Morris, quoted, 114 . Hopkinson, J., on limits to rules, 383 ; on mathematical analysis, 384 . Hornet and moth, resemblances, 288 . Horse, evolution of, 249 . Hottentots learn from baboons, 136 ; antidotes for snake venoms, 296 . Hough, Walter, acknowledgment to, xxi . Houses numbered, 351 , 352 . Howe, truss, 24 , 25 . Howe, H. M., “Iron, steel and other alloys”; “Metallurgy of steel,” 177. Howell, Wilson S., maintains uniform voltage, 243 . Howells, W. D., “Hazard of new fortunes” quoted, 306 . Hudson, W. H., on folk medicine, 295 . Hughes, David E., microphone, 147 . Hull, Gordon F., on pressure of light, 133 . “Human body,” H. N. Martin, 252 . Hungarian milling, 321 . Hussey, Obed, mower, 320 . Hutton, F. R., on gas engine, 464 . Huygens employs pendulum, 222 . Hyatt bearing, 47 , 49 . Hyde, E. P., Bureau of Standards, photometer, 235 . Hydraulic presses curved, 50 ; pressure as counterbalance, 371 . Hydrogen in thermometry, 225 . I-beam developed from joist, 10 . Ice-lens focusses solar rays, 5 . Identifying faculty, 360 . Idiom of material, 111 . Ignorance and discovery, 294 ; Bessemer’s golden, 403 . Illumination, Art of, Louis Bell, 229, foot-note . Imagination in invention, 309 ; Faraday’s powers of, 392 ; Tyndall on, 361 . Imitation of Nature, 249 . Indian gluttony, a cause of, 137 . Indicative plants, 296 . Individuality of matter, 358 . Indurated fibre, 322 . Ingalls Building, Cincinnati, concrete, 438 , 440 . Ingersoll coal cutter, 418 . Ingersoll, Ernest, acknowledgment to, xxi ; on debt of birds to feathers, 250 . Initiation in chemistry, 337 ; in photography, 338 . Injector, Giffard, 347 . Inking rollers, 40 . Inks tested with Uviol lamp, 183 . Insanity, its revelations, 379 . Insects trapped by sundew, 281 . Instruments aiding observation, 356 ; advance astronomy, 230 . Interborough power-house, roof truss, 21 ; tests coal, 241 ; exterior facing 450 ; interior facing 452 ; automatic machinery, 447 . Interchangeability old and new, 238 , 230 . Interest as prime factor in discovery, 306 . Interference water-waves, 214 ; light, 215 , 216 ; discovered by Thomas Young, 366 . Interferometer, 214-217 . Introductory, 1 . Invar, 169 ; used for time-pieces, 223 . Invention at first slow, 115 ; Bessemer on nursing and tending an, 407 ; organized in America, 414 , in Germany, 275 ; prerequisites, 271 ; social aspects of, 478 ; literature of, 486 . Inventions, origin of, O. T. Mason, 107 . Inventors improve their work in act of construction, 300 . Inverted arc-light, 75 , 76 , 381 . Iron, inflammable variety of, 151 ; crystallization, J. W. Mellor, 177 ; as electrical conductor, as affected by admixtures, 173 ; its three forms, 151 ; foundries, list, foot 178 ; history manufacture, J. M. Swank, 178 ; metallurgy, A. H. Sexton, 178 ; T. Turner, 179 ; works, directory, J. M. Swank, 178 ; steel and other alloys, H. M. Howe, 177 ; strength of wrought, 20 , 21 ; and steel manufacture, H. H. Campbell, 177 ; Sir I. L. Bell, 177 ; Institute Journal, 179 . Isolated plants, 473-74 ; serving neighborhood, 475 , 481 . Jackson, Robert T., observation leaves, 281 . James, William, on discovery, 359 ; on limits to rules, 382 . Japanese architecture, Ralph Adams Cram, 114, foot-note ; pottery, 113 , 288 ; wood-work, 113 . Jena glass, 180 ; first experiments, 181 ; refraction and dispersion, 181 ; transparent, 182 ; in photography, 182 , 183 ; in microscopy, 182 ; annealing, 182 ; in thermometry, 182 , 225 ; resists heat and corrosion, 183 ; transmits ultra-violet rays, 183 ; lenses, 255 . Jenner, Dr., vaccination, 295 . Jetties, Mississippi, J. B. Eads, 283 . Jevons, W. S., “Principles of Science,” 229 ; on discovery, 364 . Joint, Hooke’s universal, 256 . Joist, more rigid than plank, 7 ; and plank bent double, 7 . Joule, J. P., discovery of thermo-dynamic law, 212 . Journal Iron and Steel Institute, 179 . Journals, hollow, 40 . Judgment, William James on, 382 ; Alex. Bain on, 385 ; moves to new fields, 385 ; in ship design, 63 . Jupiter, size of, 121 ; fifth satellite discovered by E. E. Barnard, 285 . Justifying wedges, 323-325 . Kaiser Wilhelm II., steamer, 59 , 60 . Kelp absorbs from sea iodine and bromine, 296 . Kelvin, Lord, estimates size molecule, 131 ; defines entrance and run of ships, 53 ; on measurement, 211 . Kennedy, A. B. W., on simplification, 341 ; on economy in machines, 383 . Kepler as discoverer, 270 , 305 ; his law, 388 . Kersten, Frederick, separates diamonds from other stones, 150 . Kidneys, disease of, affects vision, 379 . Kingpost truss, 18 . Kites improved by perforation, 292 . Knitting faculty, 359 . Knives, 90 . Knowledge necessary to inventor and discoverer, 267 ; Bessemer’s view, 408 . Koebele, Albert, saves orange groves, 282 . Krakatoa volcano, 125 . Krypton, 213 . Kuzel, Hans, tungsten electric lamp, 160 . Labor, division of, modified, 480 ; saving devices in farming, 478 . Lachine bridge, 32 . Lalance & Grosjean, pressed ware, 185 . Lamp and reflector a unit, 75 ; giving heat and light, 343 ; arc, 160 ; incandescent, as standard, 227 . Langley, S. P., bolometer, 225 ; churns air in telescope, 348 ; mechanical flight, 262 ; on Cuban firefly, 263 . Larned, J. N., editor “Literature of American History,” xxii . Lathe, 95-98 ; cutters, 90 ; rotary mandrel, 48 ; tool, 93 , 94 . Lattice trusses, where best, 35 ; showing rivets, 36 . Lavoisier balance, 209 . Law as binding thread, 134 . Lead, solid, dissolves solid gold, 201 ; pipe made by pressure, 325 . Leaves observed by R. T. Jackson, 281 . Le Chatelier, electrical thermometer, 226 . Lenard, Philipp, cathode rays, 198 . Lenoir gas engine, 458 . Lens, Dollond, 254 , 255 ; Fresnel, 72 , 74 ; grinding, 83 , 84 . Le Vaillant on food eaten by monkeys, 259 . Leverrier, Urbain, discovers Neptune, 378 . Levers and limbs, 256 . Libraries, public, technological departments, 486-87 . Light causes sound, 393 ; 398-400 ; colors investigated by spectrometer, 228 ; deflects dust, 133 ; explodes a compound, 337 ; interference of, 215 , 216 ; discovered by Young, 366 ; measurement of, 226 , 228 ; polarized, reveals strains, rock structure, measures sugar, 327 ; pressure of, 133 ; reflection, 229 , total, 76-82 ; sources of, 154 ; ultra-violet, Jena glass utilizes, 182 ; violet and yellow, photographic effects, 338 ; well transmitted by Jena glass, 182 ; what it should cost in mechanical energy, 158 ; arc, inverted, 75 , 76 , 381 ; Drummond lime, 155 ; wave as unit of length, 217 . Lighthouse, curves for base, 51 ; has form of tree, 250 . Lighting, electric, 158-162 ; General Electric Co.‘s researches, 416 . Lightning paths, 245 ; protection through warm air and smoke, 294 . Lime-light, Drummond, 155 . Limits to rules, 382 . Link Belt Machinery Co.‘s Shop, Chicago, 380 . Link belting, 69 . Linotype, Mergenthaler, 323 . Literature of invention and discovery, 486 . Lithography, aluminium for, 144 . Liver as sugar-maker, 262 . Lobster’s tail, hint from, 259 . Lock-woven wire fabric, 439 . Locking bar water-pipe, Ferguson, 45 . Lockyer, Sir Norman, on stellar evolution, 204 . Locomotive with cog wheels, 345 , 346 ; gas engine for, 466 ; high pressure steam for, studied with aid from Carnegie Institution, 277 ; increased in weight, 15 ; tests, Pennsylvania R. R. Co., 241, foot-note ; with and without superheaters, 451 ; General Electric Co., 128 , 129 , 415 , 476 , facing 476 . Lodge, Sir Oliver J., on bad electrical contact, 146 . Looms, Northrup, 330 . Lubricating oil reservoirs, 447 . Lumber, how dried, 130 ; for furniture bent and seasoned at once, 343 . Lungs, separation of oxygen from air by, 261 . “Lusitania,” steamer, 128 . Luxfer prism, 74 . Mach, Ernst, on accidental discovery, 291 . Machine tools, 94-101 . Machines code their operations, 317 . Madison Square Garden curve, 50 . Magazine-rifle tubes, 40 . Magnet in steel-making, 168 ; curved, 50 . Magnets in astatic needle, 149 . Magnetism measured, Bureau of Standards, 235 . Magnetite arc-lamp, 161 . Magnetization leaves traces, 192 ; J. Hopkinson on, 384 . Magneto-electricity discovered by Faraday, 373 . Malaria and mosquitos, 295 . Mandolin pressed in aluminium, 185 . Manganese steel, non-magnetic and tough, 171 . Manganin, Weston’s, 234 . Mangle rolls, 40 . Mangling and drying at once, 343 . Mann, C. R., acknowledgment to, xxi . Mantle, gas, Welsbach, 155-59 . Manual training, 309 , 310 . Manufacturing, tendencies in, E. Atkinson, 480, foot-note . Marble is plastic, 152 ; deformed by pressure, 195 , 196 . Mars satellites discovered by Asaph Hall, 286 . Martin, H. N., “Human Body,” 252 . Mason, Otis T., “Basket work of N. A. aborigines,” 112 ; “Indian Basketry,” foot-note, 110 , 142 ; on British Columbian basketry, 110 ; on Pai Utes’ water-bottles, 111 ; “Origin of inventions,” “Woman’s share in primitive culture,” 107 . Material, idiom of, 111 . Mathematical analysis, J. Hopkinson on, 384 . Matter, constitution of, 358 ; impressed by its history, 190 . Maudslay as a mechanic, 299 ; as a trainer of other inventors, 300 ; sense of form, 308 ; slide-rest, 94 , 96 . “Mauretania,” steamer, 128 . Maxwell, James Clerk, on Faraday’s lines of force, 392 ; on cross-fertilization of sciences, 275 . Mayer, A. M., magnetic experiments, 192 , 193 . Measurement, 208-244 ; discussed by A. B. W. Kennedy, 383 ; its beginnings, 208 ; irregular areas, 347 ; light-wave as unit of, 217 ; refraction, 344 ; standards sought, 210 . Mechanical draft, 380 , 448 , 472 . Medicine, original research in, 269 , 272 , 273 . Mellor, J. W., “Crystallization iron and steel,” 178 . Memorial Bridge, Washington, D. C., 444 . Memory for observations, 293 . Mendenhall, T. C., designs pendulum, 224 . Mercer, John, and mercerization, 138 . Mercury thermometer, 225 ; vapor lamp, Hewitt, 161 . Mergenthaler linotype, 323 . Metal pressing, Bliss, 184-186 . Metallography, study of, J. W. Mellor, 177 . Metallurgical machinery, automatic, 332 . Metallurgie, Revue de, 179 . Metcalf, Wm., axe and its story, 377 . Meteorology, 338 , 339 . Metre, origin, 210 . Metric system, 210 , 211 . Michelson, A. A., portrait, facing 214 ; interferometer, 214-217 . Micrometer caliper, 236 . Microphone, origin of, 147 . Microscopy, Jena glass for, 182 . Mile, nautical, 211 . Mill, John Stuart, four methods experimental inquiry, 360 ; on sound observation, 279 . Miller, Hugh, “My schools and schoolmasters” quoted, 307 . Milling cutters, 48 , 98 , 100 , 101 ; tell story, 377 ; machine, 98 , 100 , likely to gain on planer, 173 , cuts gears, 67 . Mining in Hartz mountains, 411 ; placer, 124 ; separations in, 126 . Mississippi mud, 123 ; jetties, J. B. Eads, 283 . Mitchell, Walter A., acknowledgment to, xxi . Models and law of size, 126 , 127 . Modernizing a plant, 243 . Moissan, Henri, artificial diamonds, 265 . Moisture necessary for combustion in oxygen, 338 , 374 . Molding clay, 102 , 103 . Molds, reinforced concrete, 438 , 440 . Molecule, size, 130 ; as reservoir energy, 131 . Molitor, D. A., esthetic design of bridges, 38, foot-note . Molybdenum in high-speed tool steel, 172 . Mond gas, 461 . Monier, Joseph, reinforces concrete, 435 ; netting, 437 . Monitor, Ericsson’s, 97 , 98 . Montreal, Notre Dame de Bonsecours, 118 . Moon, size of, 121 ; motions observed by Chaldeans, 293 . Moor grass, section, 251 . Morris Building Co., Brooklyn, hot-water service, 485 . Morris, William, “Hopes and fears for art” quoted, 114 . Morse, Edward S., naturalist, archaeological observer, 287 , 288 ; on Japanese pottery, 113 . Morse signals on Burke system, 354 . Mortar, Roman, 139 . Mosquitos and malaria, 295 . Moth and hornet, resemblances, 288 . Motion may explain properties, 207 . Motive power produced with new economy, 446-477 ; of human body, 250 . Moulton, Sir John Fletcher, on coding in invention, 317 . Mower, Obed Hussey, 320 . Multiple drills, saws, punches, 290 . Murdock, Wm., introduces gas-lighting, 154 , 280 . Murphy machine shears timber, 322 . Muscles, fibrils of, 258 . Mushet, R. F., high-speed tool steel, 171 . Musical instruments and their prototypes, 257 . Narwhal tusk, 259 . Nasmyth, Alexander, invented bow string bridge, 308 . Nasmyth, James, trained by Maudslay, 300 ; on drawing, 308 . National Museum, Washington, aboriginal art, 106 . Nature a drama, not a tableau, 355 ; as teacher, 245-266 ; unity of, 357 . Nebular theory illustrated, 149 . Needle for sewing-machine, 379 . Neon, 213 . Neptune, discovery of, 214 , 378 . Newark Public Library, 487 . Newcomb, Simon, on original research, 269 ; on analysis and generalization, 277 . Newton as a boy tireless in construction, 301 ; makes a sundial and a telescope, measures force of storm, 302 ; corpuscular theory of light, 203 ; discovery of law of gravitation, 211 , 387 ; fails to observe black lines of solar spectrum, 284 ; on achromatism, 254 ; rings, 237 , 238 . New Amsterdam Theater, New York, 119 , facing 118 . New York Central R. R. Line, its course, 246 . New York Subway, reinforced concrete, 443 . Niagara Falls retiring, 123 ; turbines at, 70 , 371 . Nichols, Ernest F., on pressure of light, 133 ; sensitive thermometer, 226 . Nickel, how made malleable, 176 . Nickel-steel, 166 , 167 ; of like expansibility with glass when heated, 170 ; which shrinks when heated, 170 . Nickelin, Weston’s, 234 . Nicolaysen, N., on Viking ship, 57 . Nitro-glycerine, 409 , 410 . Nobel, Alfred, improves nitro-glycerine, 410 ; invents dynamite, 410 ; profits by accidental use of collodion, 411 ; invents smokeless powder, 412 ; character and benefactions, 413 . Noise desirable as warning, 148 . Non-conductors heat, 186-188 , 190 , 374 , 473 . Northrop looms, 330 . Norton, Prof. C. L., on window glass, 73 ; on corrosion steel in concrete, 441 . Notre Dame de Bonsecours, Montreal, 118 . Norwegian cooking box, 189 , 374 . Notes, cards for, 350 . Numbering houses and rooms, 351 , 352 . Observation, 279-298 ; a matter of mind as well as of eye, 279 ; now fuller than formerly, 152 ; Kersten’s leads to mechanical separation of diamonds from other stones, 150 ; Mercer’s, leads to mercerization, 138 . Odor, distressing, is useful, 146 . Oersted’s discovery of electro-magnetism, 230 , 290 , 373 . Office-buildings, New York, 115 . Oil engines, 466 . Oils, Bessemer improves drying of, 409 . Omission gainful, 345 , 346 . Open hearth process, 164 . Ophthalmoscope, Helmholtz, 321 , 379 . Orange groves saved from fluted scale insect, 281 . Ordway, J. M., on non-conductors heat, 187 . Ore stamps, Edwin Reynolds, 344 . Organic and inorganic series united, 357 . Organized invention, 414 . Origin of inventions, O. T. Mason, 107 . Original research, 267-278 . Osmium electric lamp, 160 . Ostwald, W., on original research in Germany, 275 . Otto gas engine, 463 . Oven and its converse, the safe, 374 . Oxygen, dry does not support combustion, 374 ; from air, 261 . Pace as measure, 209 . Packages and wrappings, 130 . Pai Utes’ water bottles, 111 . Painting by immersion, 348 ; compressed air for, 422 , 423 . Paley on proof, 359 . Palladio trusses, 22 . Panel of bridge, 23 . Paper in continuous rolls, 346 ; from wood suggested by wasp nest, 261 ; making, 322 ; steam cylinders in, 343 ; toughened, 139 ; white, as reflector, 76 . Paraffine is plastic, 195 . Parchment, vegetable, 139 . Parsons, Charles A., air compressor, 372 ; steam turbine, 453-456 , performances, 455 , on “Turbinia” and other vessels, 455 , 456 . Pascal, powers of, 270 . Pasteur’s researches, 273 . Paths of least resistance, 245 ; directive, 332 . Paunch copied in pottery, 115 , 116 . Pavements, concrete, 430 . Peabody, Cecil H., on ship models, 54 . Pearlite, 164 , facing 164 . Pearson, Karl, on original research, 277 . Pease, Edson L., acknowledgment to, xxi . Peck, Ashley P., acknowledgment to, xxi . Peckham, G. W. and E. G., “Wasps solitary and social,” 260 . Pelton wheel, 71 , 332 . Pendulum, 222 ; invar for, 170 ; compensating, 148 ; measures gravity, 224 . Pennsylvania R. R. Co., testing laboratory; “Locomotive tests and exhibits,” 241 . Pentane in thermometry, 225 ; in Harcourt lamp, 226 . Pepsine, 295 . Perch, Sacramento, totally reflected in tank, 77 . Perforated sails for ships, 291 . Phonograph, how Edison invented, 310 ; its latest form, 312 ; its directness, 343 ; sapphire for stylus, 153 . Phosphorescence, 152 ; a phase of radio-activity, 199 . Photographic action of radio-active substances, 199 . Photography, Wollaston on threshold of, 284 ; discovery of, Daguerre, 304 , 305 ; aids astronomer, 356 ; effects violet and yellow rays, 338 ; Jena glass in, 182 , 183 ; reproduces books, 324 ; silver compounds, 152 . Photometer, Bunsen’s, 227 ; Matthews‘, 228 ; Hyde’s, 235 ; Faraday’s simple, 391 . Phrenology absurd, 359 . Pianola, 333-335 . Pianos shipped in refrigerator cars, 349 . Picard measures the earth, 388 . Pickering, E. C., on astronomical co-operation, 278 . Picturing power, 307 , 309 . Piling, reinforced concrete, 438 . Pin-connected trusses, where best, 35 ; bridges, 36 , 37 . Pine tree growing by itself, 248 . Pipe, gallows, 86 ; grass, section, 251 . Pitchblende, a source of radium, 199 . Pitcher, pressed seamless, 185 . Placer mining, 124 . Planers, 97 , 98 , 99 . Planets differ in size, 120 . Planimeter, 347 . Plants, indicative, 296 . Plaster ornaments, how made, 325 . Plastic arts, form in, 103 . Plate girders, where best, 35 . Plateau’s experiment, 148 . Platinum as lamp filament, 158 . Plauen, Germany, bridge, 42 , 43 . Plow, its beginnings, 380 ; works well because simple, 340 . Plowshare improved, 91 ; of two kinds of steel, 167 ; self-sharpening, 258 ; removable, 239 . Plucker tubes, 198 . Plug and ring, 237 . Pneumatic hammer, in steel tubing, 41 ; tools, 40 , 41 ; tube cleared, 321 . Poetsch, H., freezes sand to stop influx water, 326 . Polarized light reveals strains, rock structure, measures sugar, 327 . Pomo basket, 109 . Porro prisms, 81 , 82 . Portland cement, 430 . Post of bridge, 23 . Post office and branches, 256 ; Chicago, gravity as motor in, 322 . Potential energy, 358 . Potter, Humphrey, invents self-acting valve-motion, 329 . Pottery forms, 112 ; Japanese, 113 , 288 ; of the Ancient Pueblos, W. H. Holmes, 108 , 109 ; origin of white ware, 290 . Poulsen, Valdemar, telegraphone, 313 . Powder, Nobel’s smokeless, 412 . Pratt Institute Library, Brooklyn, 487 . Pratt truss, 24 , 25 . Premium plans of wages, 244 . Press, perfecting, 48 ; Bliss, work, 184-186 ; forming die, 184 . Pressing, 103 , 184-186 . Pressure, extreme, its effects, 152 ; shaping plaster, soap, clay, lead, 325 . Priestley on observation, 293 . Primrose, mutations of, 276 . “Principles of Science.” W. S. Jevons, 229 . Prism, Porro, 81 , 82 ; total reflection, 77 , 78 , 81 , 82 . Prismatic glass, 73 , 74 . Producer gas, 459 ; advantageous, F. W. Harbord, 476 ; Dowson, for lighting, 157 . Projectiles, forms, 65 . Proof of theories, 358 . Propeller, 69 ; improved by accidental break, 291 . Properties, 135-207 ; all, probably exist in all matter, 152 , 190 , 202 , 393 ; may be due to motion, 207 , 357 ; modified, 137 ; produced as needed, 152 ; family ties, 188 ; Faraday on changes in, 206 ; may change in time, 195 ; vary in effect with rapid or slow action, 195 . Protective resemblances, 288 . Providence Public Library, 487 . Prowse, Geo. R., acknowledgment to, xxi . Ptolemy, observations, 229 ; astrolabe, 230 . Public libraries, technological departments, 486 . Pugh Power Building, Cincinnati, concrete, 439 . Pump resembles garden squirt, 371 ; screw, Edwin Reynolds, 70 ; compressed air for, 421 , 422 ; Worthington, 70 , 371 . Punches, multiple, 290 . Pupin, Michael I., telephonic researches, 366-369 . Puzzuoli ashes for hydraulic cement, 429 . Pye-Smith, Dr., on knowledge, 267 ; on disinterested quests, 272 ; on verification, 358 . Quantitative inquiry, 209 . Quarrying, compressed air in, 427 . Queen-post truss, 21 ; two, trusses form a bridge, 22 . Radiation may be material or ethereal, 203 . Radiator tubing, 87 . Radio-activity, 197-207 ; and alchemy, 203 ; may explain heat of earth and sun, evolution of chemical elements, 204 ; compared with common evaporation, 200 . Radium discovered by Pierre Curie and wife, 199 ; investigated by Ernest Rutherford, 199 ; where found, 200 ; heat of, probable life, fund of energy, 202 ; warmer than surroundings, 132 . Railroad, best lines for, 246 ; bridges, 23 ; carriages, European, 118 , 342 ; crossings, frogs, switches of manganese steel, 171 ; economies due to improved rails, 15 ; engineers observe buffalo trails, 259 ; Russian, 247 ; track cleared by steam, 124 , dipping downward, 66 , 67 ; trains, fast, Zossen, 66 . Rails for railroads, 13 ; Dudley’s forms, 16 ; steel for, 169 . Raiment, how chosen, 135 . Rammer, compressed air for, 420 . Ramsay, Sir William, “Gases of the atmosphere,” 214, foot-note . Range, steel, pressed, 185 , 186 . Ransome, E. L., designer in reinforced concrete, 436 , 439 . Ratchet bit brace, 90 . Rayleigh, Lord, discovers argon, 213 ; on electrical advances, 274 ; theory of sound, 366 . Raymond, R. W., on indicative plants, 296 . Reaping machine, Obed Hussey, 320 ; must be carefully used, 341 . Reeds, Egyptian, as drills, 93 . Reflection, 75 , 76 ; total, 76-82 . Refraction measured, 344 . Refrigerator cars for shipping pianos, 349 . Reinforced concrete. See Concrete . Removable parts of tools, 239 . Research, original, 267-278 . Resemblances, protective, 288 . Reservoir, reinforced concrete, 442 . Residual phenomena, 214 . Resistance ships, 52 , 53 , 277 ; canal boat, 282 . Resources, material, as affecting invention, 106 . Responsiveness in plants, 248 . Reuleaux, F., on seamless boilers, 46 ; on minimum number parts in machine, 341 . Reversibility, electrical, 373 . Revue de Metallurgie, 179 . Reymond, Dubois, investigates muscle and nerve, 272 . Reynolds, Edwin, screw pump, 70 ; ore-stamps, 344 . Reynolds, Osborne, on engineering problems, 274 . Rheostat, 316 . Ribbed glass, 73 , 74 . Rice, H. H., on concrete blocks, 433-435 . Rifle-making, tendency of drills, 282 . Rifling of fire-arms, 65 . Rigidity due to motion, 358 . Riley, C. V., saves orange groves, 281 . Ring drills, 91-93 . Riveting in bridges, 36 , 37 ; machine, Fairbairn, 370 . Roads, best lines for, 246 ; Roman, 410 . Roberts-Austen, experiments with alloys, preparing steel dies, 175 ; interpenetration of metals, 201 . Robins conveying belt, 68 . Rock structure, polarized light reveals, 327 ; dissolved with acid, 347 . Roller bearings, 47 , 49 ; for bridges, 38 . Rolls for steel, 104 . Roman cement, 429 ; mortar, 139 ; roads, 410 . Röntgen, C. W., X-rays, 108 . Roof truss, Interborough Co., N. Y., 21 . Roofs in France and Canada, 118 , 119 . “Roosevelt,” Arctic ship, 19 , 20 . Rope for transmission power, 347 . Rose, Joshua, on lathe tools, 94 . Ross, Dr. Donald, proves malaria due to mosquitos, 295 . Rowland, H. A., fond of experiment from childhood, 303 . Royal Bank of Canada, Havana, facing 438 . Royal Institution, London, founded by Count Rumford, 365 . Rubber may rebound from a wall or pierce it, 196 ; cylinders, hollow and solid, 40 ; vulcanization, C. Goodyear, 289 . Rudders, Chinese, with apertures, 292 . Rules have limits, 382 ; that work both ways, 369-379 . Rumford, Count, founds Royal Institution, 365 ; proves heat to be motion, 206 . Run of ships, 53 . Rupture of metal, how avoidable, 333 . Rutherford, Ernest, portrait facing 202 ; researches in radium, 199 ; in thorium; opinion with regard to helium, 202 ; spontaneous transformation of matter, 203 . “Radio-activity,” 203 . Sacramento perch totally reflected in tank, 77 . Safe and its converse, the oven, 374 . Sailing vessel forms, 55 . Sails perforated, 291 . St. Louis bridge, 31 , 41 ; why in three spans, 127 ; recent architecture, 112 . St. Remy, Church of, 43 . Salt preserves food, 138 . Sampler, 114 , 115 . San Francisco fire, reinforced concrete in, 440 . Sand blast, 124 , 424 , 425 ; polishes flints, 424 ; sifter, compressed air for, 420 ; wind blown, 124 . Sandstone for buildings, 139 . Sapphire for phonographic stylus, 153 . Saunders channeling machine, 342 . Saunders, W. L., on introduction air tools, 419 . Saw carriage directly attached, 342 ; circular, strengthened, 254 ; gang, 290 . Saws, multiple, 290 . Saxonville, Mass., Pipe-arch bridge, 41 , 42 . Schmidt superheater, 451 . Schott, Otto, Jena glass, 181 . Schuckers, J. W., justifying wedges, 324 , 325 . Schumann’s Traumerei, 333 . Screw as derived from narwhal tusk, 259 ; production of, 236 ; Rowland’s, 237 ; propeller, 69 ; with gimlet point, 90 . Scroll, free-hand, and development, 111 . Sculpture, earth, 122 ; Greek, 114 . Seamless tubes, 46 . Sectional bookcases, 351 . Sedgwick, Adam, fails in observation, 280 . Selenium, discovery, properties, conducts electricity better in light than in darkness, 394 ; special treatment, 397 ; cylinder of, 398 . Self-hardening steel, 172 . Separation, how effected, 150 . Seppings first uses trusses in ships, 19 . Sewing machine analyzed, 318 . Sexton, A. Humboldt, Metallurgy iron and steel, 178 . Shades for light, 229 . Shaper, 98 , 99 . Shearing stresses, 6 . Shears for metal and timber, 322 . Shell, Art in, W. H. Holmes, 116 ; vessel and clay derivative, 115 , 116 ; making, Bliss, 184 . Ship, 52-61 ; big, advantages, 127 , 128 ; Clipper, 57 ; cross-sections, 63 ; design, judgment in, 63 ; gas engines for, 465 ; perforated sails for, 291 ; resistances, 52 , 53 ; studies resistance and propul sion, Carnegie Institution, 277 ; Viking, 55 , 56 ; planning ship-yard, 322 . Shops, small, 480 . Siemens, Sir William, open hearth process, 164 . Signals, Westinghouse, 428 . Silk, artificial, 261 . Silo, concrete, 430 , 431 . Silt removed in stream, 124 . Silver compounds sensitive to light, 152 . Simplification, 340-354 ; undue, 383 . Size, 120-134 ; in glass-making: materials should be pulverized, 407 . Skill, manual, passes from old tasks to new, 386 . Skin scraper, Eskimo, 91 . Skins prepared for use, 138 . Slags utilized, 150 . Slide for timber, cycloidal, 341 . Slide-rest, 94 , 96 . Smallpox prevented by cowpox, 295 . Smeaton, James, discovers natural cement, 430 . Smillie, Geo. F. C., acknowledgment to, xxi . Smith, Francis P., propeller, 291 . Smith, Oberlin, on machine design, 172 . Smoke abated or not produced, 450 ; preserves food, 137 ; protects vegetation, 146 . Smoke-jack, 449 . Smokeless powder, Nobel’s, 412 . Smyth, William H., on invention, 271 . Snails, land, observed by E. S. Morse, 287 . Snake venoms, antidotes for, 296 ; studied Carnegie Institution, 277 . Snow, Walter B., “Steam boiler practice,” 450 . Soap, shaping by pressure, 325 . Social aspects of invention, 478 . Sociological observations, Karl Pearson on, 277 . Soda formerly wasted now used, 150 . Soil tillage, 124 . Solenoid, 316 . Solid contents ascertained, 343 , 344 . Solids and surfaces, law of, 122 . Sound caused by light, 393 , 398-400 ; enables a pneumatic tube to be cleared, 321 ; interference of, 366 ; mill, Dvorak, 132 . Sparks, electrical, useful, 147 . Sparrows feeding, 136 . Specialization, Thomas Young on, 365 ; and group attack, 416 . Specific gravity learned, 344 . Spectacles, bi-focal, 85 . Spectrometer investigates colors of light, 228 . Spectroscope, Fraunhofer invents, 284 ; utilized, 218 . Spinning, 126 ; jenny, Hargreaves invents, 290 . Spiral grooves in fire-arms, 65 ; steel tube, 42 . Spring, W., makes alloys by pressure, 201 . Square root extractor, 376 , 377 . Squirt, garden, 371 . Staircases, curved joints for, 49 . Stamping, 103 ; machines curved, 50 . Standard sizes in manufacturing, 239 ; in power plant, 385 ; of measurement sought, 210 ; electrical measurement, 239 ; Bureau of, 234-236 ; two varying yards, 195 . Stars, fixed, observation of, 213 ; double, measurements, Sir David Gill, 286 ; observed by E. E. Barnard and S. W. Burnham, 285 , 286 . Stas, elimination of sodium, 364 . Steam, Watt’s study of, 361 ; and gas engines compared, 466 ; engine, automatic auxiliaries, 329 ; condensers, 87 ; Weighton’s, 452 ; losses, H. G. Stott, 469-71 ; performances, 448 , 451 ; resembles garden squirt, 372 ; multiple cylinders, 372 ; Watt’s first, 101 ; Allis-Chalmers, facing 448 , facing 452 ; hammer directly attached, 342 ; high-pressure, for locomotives, studied Carnegie Institution, 277 ; turbine, 452-456 , Westinghouse-Parsons, facing 454 , costly experiments, 414 , should be joined to steam engine, H. G. Stott, 470 ; and both to gas engines, 471 . Steamer forms, 55 ; for cargo-carrying, 59 , 61 . Steatite fibres, 235 . Steel, 163-179 ; annealing, 168 , J. V. Woodworth, 179 ; barrel pressed, 185 ; Bessemer’s story of his process, 403-407 ; corrodibility reduced, 167 ; crystallization, J. W. Mellor, 178 ; dies, 175 , effects of use, 358 ; drills, 418 ; electric and magnetic qualities, 151 ; examined microscopically, 163 ; expanded, 437 , 438 ; for biggest structures, 128 ; for mechanical flight, 129 ; forging, J. V. Woodworth, 179 ; hardening, J. V. Woodworth, 179 ; heat treatment, 167 , study aided by Carnegie Institution, 277 ; high-speed tool, 171 ; in architecture, 119 ; invar, 169 ; iron and other alloys, H. M. Howe, 177 ; manganese, non-magnetic and tough, 171 ; manufacture of, H. H. Campbell, 177 ; manufacture iron and, Sir I. L. Bell, 177 ; mechanical treatment, F. W. Hall (See under Harbord ), 177 ; Metallurgy, F. W. Harbord, H. M. Howe, 177 , A. H. Sexton, 178 , T. Turner, 179 ; pressed, car, 186 ; rails, 169 , wear at Crewe, 406 ; range pressed, 185 , 186 ; rolls, 104 ; strength of, 20 , J. Hopkinson on, 384 ; tempering, 168 , J. V. Woodworth on, 179 ; to order, 166 ; tube, spiral, 42 ; tubing, uses for, 40 , 41 ; under microscope, facing 164 ; J. W. Mellor, 178 ; used unduly thick, 117 ; wire, strength, 32 ; works directory, J. M. Swank, 178 . Steinheil’s ground wire in telegraphy, 346 . Stephenson, George, as a mechanic, 299 ; railroad lines, 246 . Stewart, Balfour, on meteorology, 338 . Stoker, automatic, 330 , 450 ; underfeed, 380 . Stolp radiator, 87 . Stone outlines, 112 ; as chosen by Indians, 143 ; broken by frost, 123 . Stop motion, 330 . Storage cell, Edison, 374 . Stott, Henry G., acknowledgment to, xxi ; on power plant economies, 469-71 . Stoughton, Bradley, acknowledgment to, 173 ; list of books on iron and steel chosen and annotated by, 176 . Stoves for heating, 86 ; Canadian box and dumb, 86 . Strains in bridges studied, 25 ; revealed by polarized light, 327 . Strap rail and stringer, 13 . Stream, model, by James Thomson, 283 . Stresses tested, 192 ; recurrent, 191 . Strowger, Almon, inventor automatic telephone, 337 . Strut of bridge, 23 . Sturgis, Russell, on modern architecture, 119 . Sturtevant ventilating and heating apparatus, 380 , 472 . Sugar, polarized light measures, 327 . Sugar-cane mill, Bessemer’s, 402 . Sulky in steel tubing, 41 . Sulphate of ammonia from Mond plant, 461 . Sun, size of, 121 . Sundew traps insects, 281 . Superheaters, 450 , 451 . Surfaces and solids, law of, 122 . Surveying, invar wires for, 170 . Suspension bridges, 32 ; where best, 35 . Swallow, bank, lesson from, 297 . Swank, J. M., Directory Iron and steel works; History manufacture iron, 178 . Tainter, Sumner, aids Professor A. G. Bell in perfecting photophone, 393 . Talking Machine, Faber, 343 . Tamarac copper mine, stamp, 344 , 345 . Tamping, compressed air for, 420 . Tanks, experimental, for ship models, 54 , 55 ; U. S. Navy, facing 54 ; reinforced concrete, 441 . Tantalum electric lamp, 159 , 160 . Taylor gas producer, 460 . Team work in research and invention, 415 . Telautograph, Gray, 313 , facing 318 . Telegraphic registers, Edison’s, 310 . Telegraphone, Poulsen, 313 , facing 314 . Telegraphy, ground wire in, 346 ; codes in, 352-354 . Telephone, Professor Bell’s narrative of invention, 393, foot-note ; earnings, 484 ; as part of photophone, 395 ; two conductors for, 149 ; automatic, 335-337 ; central station, 257 ; researches, M. I. Pupin, 367-369 . Telescope, aid from, 356 ; air churned in, 348 . Tellurium added to bismuth, 175 . Tempering steel, 168 . Tension, 8 ; members need not be of rigid material, 19 . Terra cotta, 323 . Testing apparatus, Emery, 242 ; Laboratories, Electrical, N. Y., 242 ; materials, American Society for, 241 ; International Association for, 241 ; industrial, increasing in demand, 243 . Thacher, Edwin, bar, 436 ; on reinforced concrete bridges, 436 , 444 . Thawing ice by electric heat, 347 . Theater, New Amsterdam, New York, 119 , facing 118 . Theories, how reached and used, 355-386 . Thermo-electricity and its converse, 373 . Thermometer, mercury, 225 ; Jena glass for, 182 . Thermometry, interferometer in, 216 . Thomas, Carl C., “Steam turbines,” 456 . Thomas, J. J., “Farm Implements” quoted, 340 . Thompson, Benjamin, founds Royal Institution, 365 ; proves heat to be motion, 206 . Thomson, James, models stream, 283 . Thomson, Joseph J., on electrons, 132 ; on cathode rays, 198 . Thorium radio-active, 199 ; Ernest Rutherford’s researches in, 200 ; two substances separated from, by Charles Baskerville, 200 ; in gas mantle, 156 , 157 . Through bridge, 24 . Thurston, R. H., on inventors of the past, 265 ; on planning investigation, 270 . Tie of railroad, 13 ; bridge, 23 . Tiffany, George S., improves telautograph, 317 . Tiles, roofing, studied by E. S. Morse, 288 . Tilghman, B. C., sandblast, 124 , 424 . Tillage soil, 124 . Timber, Murphy machine shears, 327 ; slide, cycloidal, 341 . Time modifies properties, 138 ; measurement, 221 , 222 ; service, W. U. Telegraph Co., 330 . Tool design, 89 ; materials for, 136 ; machine, 94-101 . Tooth of beaver, 258 . Torpedo-boat destroyer, 62 , 64 . Total reflection, 76-82 . Towers, Beauchamp, researches on friction, 274 . Track indicator, Dudley’s, 14 . Trade, how it began, 219 . Training, manual, 309 , 310 . Transmission motive power, 347 . Traumerei, Schumann’s, 333 . Tray, wooden, and clay derivative, 115 , 116 . Triangle as stable form, 18 , 19 . Triggers, chemical, 337 . Truss, model of simple, 19 ; Baltimore, 25 ; Howe, 24 , 25 ; kingpost, 18 ; Pratt, 24 , 25 ; queen-post, 21 ; Palladio, 22 . Tubes, Mannesmann, 46 ; for radiators, 87 . Tungsten in high-speed tool steel, 172 ; electric lamp, 160 . Tunnel, bank swallow gives hint for, 297 ; bored through frozen ground, 326 ; concrete, 430 . Turbine wheels, 69 , 70 ; Francis vertical, 446 ; reversed as pump, 371 ; supported by upward pressure water, 371 ; steam, reversed as air compressor, 372 . (For other entries see under Steam-turbine .) Turner, Thomas, Metallurgy iron and steel, 179 . Turret lathe, 97 . Twist drills, 93 . Tyndall, John, on dogmatism, 363 ; on imagination, 361 ; on original research, 273 ; on scientific co-operation, 274 ; on verification, 362 . U-bend in pipe, 88 . Ultra-violet rays, Jena glass utilizes, 182 . Umstead, C. H., strengthens concrete with crushed stone, 240 . Uniform voltage economizes lighting current, 243 . Unit systems, 350 , 351 . United States Geological Survey, coal testing plant, 241, foot-note ; Steel Co., as carriers, 415 . Unity of nature, 357 . Uranium, radio-active, 199 . Use creates beauty, 104 , 105 . Uviol lamps, 183 . Vacuum, James Dewar produces, 327 ; cleaning method, 423 , facing 164 . Valve-motion, Humphrey Potter’s, 329 . Valves of veins, 251 , 252 . Van Vleck, John, acknowledgment to, xxi . Variations seized, 249 . Vase from tumulus, 116 . Vegetation, engineering principles in, 247 ; smoke protects, 146 . Vehicles, forms, 65 . Veneer as wall covering, 342 . Ventilating and heating, Sturtevant methods, 380 , 472 . Verification, Tyndall, 362 . Vial and bubbles, 127 , 128 . Victoria Bridge, Montreal, 26-28 . “Victorian” driven by steam turbines, 455 . Viking ship, 55 , 56 . Vines saved from phylloxera, 289 . Violet, zinc, 296 . Violins improve with use, 192 . Volcanic outbreaks, 245 ; Krakatoa, 125 . Voltmeter, Weston’s, 232 . Volutes in turbines, 69 . Vulcanite somewhat transparent, 338 . Wachusett Dam, concrete, 431 . Wadsworth, F. L. O., improves interferometer, 217 . Wage-earners, more in manufacturing than formerly, 479 . Wages, premiums in, 244 ; American, average in 1900, 486 . Waidner, Dr., Bureau of Standards, 235 . Wallace, A. R., facts and arguments, 359 . Warship curves, 51 . Wasp nest suggests paper from wood, 261 ; using pebble as hammer, 260 . Wastes prevented, 149 . Watches and watch-making machines, 222 . Water, angle total reflection, 77 , 78 ; boiling point lowered as atmospheric pressure lessens, 375 ; courses deepened, 123 ; current, two modes of measuring, 370 ; expands in freezing, pressure lowers freezing point, 375 ; gas, 459 ; moving, as source of power, 360 ; pipes gradually joined, 50 , reinforced concrete, 442 ; supply indicated by vegetation, 297 ; tight basketry, 142 , 143 ; under pressure for power transmission, 348 . Watson, Egbert P., suggests steel tubing for bridges, 41 , 42 . Watt, James, a mechanic from boyhood, 299 , 302 ; articulated water-pipe, 258 ; study of steam, 361 ; first steam engines, 101 ; on omissions, 346 ; suggests metric system, 211 . Wax, shoemaker’s, is plastic, 195 . Weapons, materials for, 136 . Weather predictions, 338 , 339 . Weaving, its beginnings, 138 ; materials, 110 . Wedge extracts square root, 376-77 ; justifying, 323-25 ; front automobile, 66 . Weighton, R. L., steam condensers, 452 . Welsbach, Dr. Auer von, portrait, facing 156 ; gas mantle, 155-59 , and Holophane globe, 81 ; osmium electric lamp, 160 . Western Union Telegraph Co., time service, 330 . Westinghouse brakes and signals, 428 . Weston ammeter, 233 ; voltmeter, 232 ; factory, 234, foot-note . Wheel, balance, in time-pieces, 222 ; Earnshaw’s compensated, 223 ; bicycle, 382 ; carborundum, 101 , 102 ; emery, 101 , 102 ; flange on, instead of on track, 370 ; Pelton, 71 ; spokeless, 66 ; toothed, 67 . Whetham, W. C. D., “Recent Development of Physical Science,” 204 . Whipple bridge, 25 . White, J. G. & Co., effect economies, 244 . White ware, origin, 290 . Whitney, Eli, interchangeability, 239 . Williamsburg suspension bridge, 32 , 33 . Wind, work of, 124 . Windmill vanes, 70 ; and fan blower, 371 . Wire fabric, lock-woven, 439 ; shaped by hydraulic pressure, 326 ; shortened, 81 ; tempered as drawn, 343 . Wollaston, observes black lines in spectra, 284 ; on threshold of photography, 284 . Wolvin, Augustin B., ore carrier, 69 . Woman’s share in primitive culture, O. T. Mason, 107 . Wood, strength of, 21 ; compressed, 152 ; borer, compressed air for, 420 . Wood, Dr. Casey A., on diseases of the eye, 379 . Wood, R. D. & Co., gas producer, 460 , 466 . Wooden tray and clay derivative, 115 , 116 . Woodward, C. M., on manual training, 309 , 310 . Woodward, R. S., Carnegie Institution for Original Research, 276 ; portrait, facing 276 . Wood-work, Japanese, 113 . Woodworth, J. V., Hardening, tempering, annealing and forging steel, 179 ; on milling cutters, 377 . Work from fuel in human body, 263 , 264 . Worthington pump, 70 . Wrappings of merchandise, 129 . Writing appliances, 114 . Wyer, Samuel S., Producer-gas and gas-producers, 462 . Xenon, 213 . X-rays examine electric cables, 327 ; make air electric conductor, 282 . Yokut basket bowl, 112 . Young America, clipper ship, 57 , 58 . Young, Thomas, discovers interference light, 366 ; on discursiveness, 365 . Zahm, A. F., mechanical flight, 262 . Zeiss binocular glasses, 81 , 82 . Zinc violet, 296 . Zirconium for gas mantle, 156 . Zuni water vessels, 108 .

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