734 



INDEX. 



Generators, in marine engines, 456 ; in 

 locomotives, 466 



Geodetic observations, 18 



Geography, photographic illustrations of, 

 324 



Geological section of the basin of the Seine, 

 45 



George's correction of engravings by elec- 

 trotype, 708 



German stoves, 347 



German flutes, 170 



Giffard's experiments in aerial navigation, 

 101 



Gil lot's process of photolithography, 318 



Girard's improvements in microscopic 

 photography, 310 



Gloesener's two-needle telegraph, 555 



Glaisher, James, meteorological experi- 

 ments with balloons, 95, 103 



Glasses, musical, 126 



Glass, photography on, 305 



Glass, (See Burning-glasses, burning mir- 

 rors, and mirrors.) 



Godard, E., hot-air balloons, 94 



Goddard's improvement on the daguerreo- 

 type, 295 



Gold-platirg by electro-type, 703 



Gongs, 123 



Goods locomotive engines, 470, 472 



Gouband's ice-machine, 386 



Governors of steam-engine, 423, 426 



Graduation-pile for evaporation of salt- 

 waters, 380 



Graham's compensation pendulum, 371 



Gramme's magneto-electric machines, 665, 

 666, 667, 668, 685 



Grates. (See Fire and fireplaces. ) 



Gravity, direction of, 17 



Great Eastern steamship, 456, 457, 615 



Gregory's application of mirrors to reflect- 

 ing telescopes, 263, 268 



Green's balloon ascents, 95 



Greenwich mean time, and electric time 

 signals, 645, 646 



Greenwich Observatory, sidereal clock at, 

 373 



Griffith's screw-propeller, 453 



Gronvelle's hot-water and steam heating 

 apparatus, 354 



Grove's improvements in photography, 314 



Guarnerius, of Cremona, his violins, 119 



Guitars, 152 



Gutta-percha covering for telegraph wires, 

 612 



Gyroscope, 28 



H. 



Haarlem, lake drained by steam power, 



55 ; great organ at, 184 

 Hackworth's improvements in locomotives, 



462, 466 



Hadley, inventor of the sextant, 206 

 Hair a protection from cold, 359, 360 



Halse's electro-medical apparatus, 722 



Halske and Siemens' lightning-conductor 

 for electric telegraphs, 627 



Hammer, steam, 488 



Hand fire-engines, 58 



Harmonicn, 120 



Harps, 120, 135, 138, 154 ; Welsh, 159; 

 Burmese, 160 



Harpsichords, 166 



Harris's lightning-conductors for ships, 

 542 



Harrison, inventor of the gridiron pendu- 

 lum, 370 



Hassenfratz on speaking-trumpets, 111 



Hautboys, 120, 168, 172, 173 



" Hazir," or harp of the Jews, 135 



Heat, application of the laws of, 2, 8, 333 

 515 



Heating powers of coal and other fuel, 355 



Heat produced by electricity. 701 



Heights measured by the barometer, 84 



Heliography, 307, 313329 



Heliostats, 212 



Helmholtz, improvements in stereoscopes, 

 284 



Hemp covering for telegraph wires, 613 



Henley's magneto-telegraph, 556 ; needle- 

 telegraph, 557 



Heptachord harp of the ancient Greeks, 

 137 



Hero of Alexander, his invention of the 

 eolipyle, 389 



Herschel, Sir John, discovery of the solvent 

 action of hyposulphite of soda, "294 ; 

 astronomical photography, 327 



Herschel, Sir W., improvements in t^le- 

 scopes ; great telescope at Slough, 264, 

 267 ; mirrors ground and polished by 

 him, 269 



High-pressure steam-engines, 426, 428 ; 

 for navigation, 455 ; locomotives, 468 ; 

 ploughing- machines, 487 



" Hing-Kou," or Japanese tambourine, 134 



Hipp's electric clock, 642 ; modification 

 of Wbeatstone's chronoscope, 049 



Hoe's ten-feeder strain printing machine, 

 493 



Holmes's electric time-signals, 645 ; mag- 

 neto-electric machines, 662 



Holophotal arrangement in lighthouses, 

 228 



Horizontal fire-engine, 61 



Horizontal steam-engine, 427, 428 



Horns, 120, 168, 174 

 Horology, electric, 633 



"Horse-power," defined; application of 

 the term to the work of steam-engines, 

 435 ; of paddle-wheels, 448 ; of marine- 

 engines, 455 



Hot-air, heating by, 349 



Hot-air balloons, 91 



Hot-air engines, 506 



Hot-water heating apparatus, 349, 351 



Houdin, Robert, his electric regulator, 637; 

 electric clock, 641 



