INDEX. 



599 



Friction wheels, 164, PI. 14, 18. 



Frigid zone, 436. 



Fringes of colours, 366, 367- 



Frisi, 192. 



Fulling, 143. 



Fulton, 271. 



Furnaces, 265. 



Fusee of a watch, 148, PI. 15, 16. 



Fusorius, 188 ; fl. 1450. 



Fust, 189. 



Gages for air pumps, 261, PI. 22. 



Galen, 352. 



Galilean telescope, 334, 336, PL 28. 



Galileo, 24, 31, 34, 147, 189, 190, 207, 277, 316, 



376, 458; b. 1562, d. 1642. 

 Gallon, 85. 



Galvani, 523, 587, 588 ; b. 1737, d. 1798. 

 Galvanic battery, PL 40. 

 Galvanic circuit, PL 40. 

 Galvanic electricity, 521. 

 Galvanism, 587- 

 Galvanometer, 540. 

 Ganges, 223, 224. 

 Garnerin, 233. 

 Garnet, PI. 17. 

 Gases, 291, 4?0. 

 Gasometer, 263, PL 24. 

 Gates, 131. 

 Gay Lussac, 285. 

 Gellibrand, 583; b. 1597, d. 1636- 

 Gemini, 401. 

 Gemma, 393. 

 Geneva, 545. 

 Gensfleisch, 188. 

 Geoffrey, 586. 

 Geography, 435. 

 Geology, 563. 



Geometry. Instrumental geometry, 71. 

 Geometry of mechanics, /I. 

 Georgian planet, 398, 405, 424. 

 Germination, 567. 

 Gerstner, 227- 



Gesner, 583, 584 ; b. 1516, d. 1565. 

 Gilbert, 532, 583. 

 Gin, 157- 

 Gioja, 583. 

 Givre, 555. 

 Glass, 477. 

 Glass blower, 200. 

 Glass blowing, 171. 

 Glass drops, 494. 

 Glass vibrating, 301. 

 Glauber's salts, 493. 

 Glazier's vice, 1?!, PL 18. 

 Globe, 432. 

 Globes, 394. 



Globules for finding specific gravities, 236. 

 Globules for microscopes, 330. 

 Glottis, 312, 313, PL 26. 

 Going fusee, with an intermediate spring, 148, 



PL 16. 



Golden number, 429. 

 Gold leaf, 322. 

 Gong, 314. 

 Gorlaeus, 584. 



Gothic architecture, 127, 187- 

 Gothic roof, PL 12. 

 Grafting, 570. 

 Graham, 85, 150, 153, 461. 

 Grain, 95. 

 Gramme, 96. 

 Granite, 176, 177- 

 Grave harmonics, 306, 317. 

 Gravesande. See S'Gravesande. 

 Gravitation, 23, 29, 409,411, 458, 471, 508, PL 34. 

 Gravitation of light, 361. 

 Gravity, 582. 



Gray. Stephen Gray, 510, 585, 586 ; d. 1736. 

 Grecian year, 427- 

 Greeks, 74, 181, 453. 

 Greenwich, 150, 460. 

 Gregorian calendar, 428. 

 Gregorian telescope, 335, PL 28. 

 Gregory, 335, 378, 458. Pope Gregory, 316, 428. 

 Gridiron pendulum, PL 16. 

 Grimaldi, 342, 366, 377. 



Grinding, 176. 



Groups of stars, 392. 



Growth, 539. 



Guericke, 207, 260, 278, 585 ; b. 1602, d. 1686. 



Guglielmini, 2785 b. 1655, d. 1710. 



Guido of Arezzo, 316; fl. 1026. 



Guitar, 311. 



Guldinus, 189. 



Gulf stream, 449. 



Gun, 268. 



Gunnery, 31- 



Gunpowder, 103, 268, 277- 



Gunter, 189, 583 ; b. 1581, d. 1626. 



Gunter's scale, 82. 



Gutenberg, 188. 



Guyot, 583. 



Guy ton, 589. 



Gwynn, 256, PI. 23. 



Gymnotus electricus, 523. 



Hadley, 548, 585; d. 1744. 



Hartley's quadrant, 80, 82, 430, Pi. 35. 



Hair hygrometer, 554. 



Hales, 278; b. 1677, d. 1761. 



Haley, 151. 



Halifax, 190. 



Hall, 379. 



Halley, 191, 389, 406, 408, 414, 432, 459, 460, 535, 



548, 585; b. 1660, d. 1742. 

 Halos, 347, PL 29. 

 Hamilton, 50. Captain T. Hamilton's gage, 243, 



PL 22. Sir W. Hamilton, 561, 562. 

 Hammer, 61, 158. 

 Hammering, 110, 170. 

 Hammering brass, 538. 

 Hammer of the ear, 302. 

 Hanin, 98. 

 Harbours, 240. 

 Hard bodies, 289. 

 Harding, 404, 462. 

 Harmonica, 314. 

 Harmonic curve, 289. 

 Harmonics, 196, 304. 

 Harmonic sounds, 296, 298. 

 Harmony, 306. 

 Harness, PL 18. 

 Harp, 311. 

 Harpsichord, 311. 



Harrison, 150, 153, 192, 461 ; b. 16iM, d. 1776. 

 Harvest moon, 421. 

 Harvey, 584 ; b. 1578, d. 1657- 

 Hats, 143. 

 Hatton, 85. 



Hauksbee, 225, 227, 278, 585, 589. 

 Hautboy, 314. 

 Hauy, 586. 

 Hawser, 140. 

 Hearing, 301, 303. 

 Hearing trumpet, PI. 25. 

 Heart, 220. 



Heat, 474, 484, 514, 532, 582, 584, 589, 589,586, 

 PL 39. 



Effect of heat on sound, 289. 



Effect of heat on vibrations, 297- 



Nature of heat, 496. 

 Heat from electricity, 518. 

 Heat from mirrors, 330. 

 Heat of different latitudes, 545. 

 Heat of mixtures, 496. 

 Heat producing a draught, 264. 

 Hecla, 535. 



Height of mountains, 206. 

 Height of tides, 448. 

 Heights, PI. 38. 

 Helfqstate, 333. 



Hemispherical counterpoise, 203. 

 Hemp, 140. 

 Henderson, 390. 

 Henley, 527, 528, PL 40. 

 Henry the Sixth, 188. 

 Heraclitus, 581, 582 ; fl. 506, B.C. 

 Hercules, 395, 397. 

 Hermann, 191 ; b. 1678, d. 1733. 

 Hermes, 315, 452. 



Hero, 145, 158, 185, 186, 258, 276 ; fl 130, B.C. 

 Herodotus, 182. 

 Hero's cupping instrument, PL 24. 



