Dias, Bartholomew, 125 Diet at Spires, 131 Diet at Worms, 131 Disc for polishing, 43 Divine Right of kings, 146, 147 Dodge, 274 Domestication of brutes, 13 Drager, 327 Draper, 221 Drebel, 142 Dry-plate photography, 265 Duodecimal system, 31, 32 Duplex telegraph, 285 Dynamics, 159 Dynamite, 277 Dynamo electric machine, 275 E East India Company, 257 Eastman, 304 Eberth, 295 Eddy, 277 Edison, 123, 292, 310, 328, 285 Egyptian religion, 38 Electric light, 149 Telegraph, 215 Cautery, 239 Locomotive, 245 Candle, 290 Railway, first, 293 Welding, 302 Furnace, 312 Motor, 217, 218 Electrically propelled boat, 221 Electricity, 148 _et seq_ Electromagnetic theory of light, 284 Electron, 293 Electroplating, 182 Electrostatic induction, 247 Elevator, 272 Embalming, 35 Ericsson, 10, 68, 214, 220, 270, 271, 272 Ether as an anæsthetic, 221 F Fahrenheit, 142 Faraday, 138, 199, 214, 247 Farmer, 246 Faure storage battery, 294 Feudal system, 145, 146 Field, Cyrus, 266 Finlay, 327 Finsen, 313 Fire alarm telegraph, 247 Fire, 5 First American locomotive, 217 First electric telegraph, 232 First successful aeroplane flight, 326 Fiske, 312, 326, 328 Fitch, 180 Flexner, 328, 329 Flute, 49 Flying boat, 327 Foucault, 235 Fox, Talbot, 247 Foy, 294 Franklin, 168, 169, 170, 256 Frederick the Great, 166 _et seq_ Frederick William, 165, 166, 279 French Revolution, 260 Friction matches, 213 Fulton, 180 G Galileo, 135, 136 Galvani, 138, 200 Galvanization, 220 Galvanometer, 200 Gardner, 265 Gas engine, 291 Gas mantle, 302 Gatling gun, 273 Gaul, 86 to 95 Gaza, 73 Ged, 164 Geometry, 37 German Confederation, 261 Giffard, 265 Gilbert, 137, 138 Gimlet, 57 Goldschmidt, 327 Goodyear, 220, 284 Gorham, 286 Gorrie, 245 Gramme, 283 Graphophone, 302 Gravitation, Law of, 144 Great Eastern, 266 Greece, 45 Greek fire, 96, 97 Green, 269 Greener's hammerless gun, 294 Groves gas battery, 267 Guericke, 142, 143, 148, 149, 216 Gun carriage, 108 Gun-cotton, 240 Gun director system, 312 Gun, 101 to 110 Gunpowder, 39 Guthrie, 215 Guttenberg, 7, 111 Gyroscopic compass, 326 Gyroscopic stabilizer, 327 H Hadley, 145 Hales, 184 Hall, 308 Hammurabi, 38 Hanaman, 327 Hand photographic camera, 298 Hannibal, 84, 85 Hargreaves, 172 Harvey, 140, 141 Harveyized armor, 304 Heat, a measure of work, 212 Hebrews, 45 Hellenistic civilization, 76, 77 Helmholtz, 246 Henry, 214, 216, 252 Herman, 247 Hero, 149, 150, 151 Hertz, 304, 305 Hewitt, 326 Hibbert, 244 High speed printing press, 327 Hoe, 235, 242 Holy Alliance, 260 Homer, 205 Hooke, 145, 162 Horseshoe machine, 218 Howe, 236