28 



GENERAL INDEX. 



Georgium Sidus and his six moons, account of 



GILBERT, the earliest scientific electrician 



GIL PIN and Canton, their table of the variations of the 



compass .... . 



Glass, comparison of the aberration of light by, with that of 

 sapphire and diamond 



. . globules substituted for small lenses, or microscopes 

 description of a thermometer with . 



. . rods and tubes, table of expansibilities of 

 . . prism, on the transmission of light through . 

 Globe, terrestrial, representation and description of 

 Gold-leaf electrometer, description of .... 



galvanoscope, description of .... 

 Graduation of the scales of thermometers, directions for . 

 Graphic telescope, description of . . 



Gravitation defined and illustrated 



Newton's, discovery of its universality 

 and pressure of fluids, explanation of their action 

 Gravity, centre of, explained and illustrated . 



specific, of bodies, explained .... 

 its effects more obvious in fluids than in solid bodies 

 Gregorian telescope, description of ... 



GRIMALDI'S discovery of the inflexion, or diffraction, of light 

 Grinding of specula and lenses .... 

 . . of microscopic lenses . . . 



HATCHETT'S dry galvanic pile, account of . 



HALE'S thermometer described .... 



HAL LEY, Hooke, and Boyle, their 'proposed scale for thermo- 

 meters . . . . . 



observations on the light in a diving-bell 

 Hardness of iron and steel favourable to their magnetic power 

 HARE'S calorimeter, description of . 

 Harmony of sounds, how produced 



distinguished from melody 



HARRIS'S experiments on the magnetism of rotation . 

 HART'S galvanic battery described ....'. 



HAUY'S electroscope described . . 

 Heat, effects of, described . . . 



. . of the seasons, its diminution caused by the obliquity 

 of the sun's rays . . . . . 



. . the ancients had no means of measuring . 



. . imperfections common to all instruments for measuring 



. . table of the expansion of bodies by . 



. . table of various points of, according- to Wedgwood 



. . its effects upon the powers of a magnet 



. . favours the progress of magnetic induction, but impairs 



its permanency ...... 



. . produced by the voltaic battery to a great intensity 

 . . experiments on its evolution by the voltaic battery 

 Heavenly bodies, on the apparent situation of . 

 Height of the boiling point of water in different states of the 



barometer . . .".'.. 



Helical rotations, exhibition of ..... 



coil (balanced) assumes the positions and directive 

 properties of the magnetic needle . . . 



and rectilineal conductors, mutual action of . 

 Henley's universal discharger described 



electrometer described . . . . 



HERSCHEL'S periscopic combination of lenses 



front-view reflecting telescope . . 

 aplanatic telescope .... 



. . table of dimensions of a double aplanatic object 



glass ... 



experiments on the magnetism of rotation . 

 Hitls, why tneir attraction does not draw houses towards 

 them . . ; , 



. . accumulation of water in . 

 History of tHe discovery of the local attraction of vessels 



POP. INT. 



ELECT. . 



MAGN. 



NEW. OPT. 

 OPT. INST. 

 THERM. 



POP. INT. 



ELECT. 



ELECT. MAGN. 

 THERM. . 

 OPT. INST. 

 POP. INT. 



NEW/ OPT. 

 OPT. INST. 



GALV. 

 THERM. 



NEW. OPT. 

 MAGN. 

 GALV. . 

 POP. INT. 



MAGN. 

 GALV. . 

 ELECT. 

 Pop. INT. 



THERM. 



MAGN. 



GALV. 

 POP. INT. 



THERM. 

 ELECT. 



ELECT. 

 ELECT. . 



Pao;e 



36, 37 



1 



32 



13 



. 38 

 3 



. 63 

 90 



. 40 

 19 

 45 



1315, 5G 



26 



5 



39 



57, 58 



9, 1820 



59, 60 



. 56 



10, 16 



10 



. . 30 

 35 



. 27 

 9 



4,5 

 38 



. 14 

 4 



. 73 

 73 



94, 95 

 8 



. 3 

 4 



46, 47 

 1 



5156 



6J,62 



29 



12,13 



12 



. 10 

 12 



87 



15 



OPT. I: 



