18 



GENERAL INDEX. 



Astronomical telescopes, achromatic, described 



eye-pieces for .... 



Astronomy, popular introduction to .... 



objections to the presently-received system an- 

 swered . . . . . 



Atmosphere, experiments on the electricity of . 



, . its pressure on the human body, how counteracted 



tides in, as well as in the ocean 



Atmospheric air, its mechanical properties . . 

 refraction observed by Ptolemy 

 pressure, variation of, its effects on the boiling 

 point of water ....... 



its effects on thehulbs of thermometers 



Attraction in bodies denned and illustrated ... 



. . of cohesion ....... 



of gravitation ...... 



of mountains upon a plummet 

 of houses and churches by neighbouring hills 

 . . and repulsion, electrical, explained . . 



experiments on . 

 . . . . of magnetic iron 



of magnetism analogous to that of 

 electricity . ........ 



of iron by the magnet, illustrations of 



opinions of the ancients 

 respecting its cause ....... 



local, of vessels, general account of . . . 



Barlow's experiments on that 

 subject ......... 



cause of the loss of certain ships 

 Barlow's proposed remedy for the 

 evil ......... 



chronometer disturbed by . . 



Aurora Borealis affects the magnetic needle . . 

 Axioms, Newton's, respecting light ..... 



Azimuth compass, construction of . . . . . 



Rater's, described .... 



BABBAGE and Herschel's experiments on the magnetism of 

 rotation ......... 



BACON, Friar, his description of magnifiers and combined 



lenses 



the inventor of the camera obscura 

 Balance, thermometer, description of . 



electrometer ....... 



(torsion) ....... 



Balloons, cause of their ascent . . . . 



the earth appears to sink from under them 

 BARLOW'S hypothesis concerning the variation of the needle 

 experiments on the local attraction of vessels 

 proposed remedy for 



Barometer, table of the effects of its different states on the 

 boiling point of water ....... 



its principle and construction . . . 

 Barometrical thermometer described .... 



BARTOLINUS'S experiments on Iceland spar . . 



Battery electrical, description and construction of 



and galvanic, different effects of 

 voltaic or galvanic. See Galvanic. 

 Beautiful experiment of the combustion of Mercury 

 BENNET'S gold-leaf electrometer described . 

 BERNOUILLI'S method of obviating an error in the dipping- 

 needle ...... ... 



BIOT'S experiments on electricity .... 



Bird, action of in flying ...... 



Bismuth and antimony best fitted for producing thermo- 

 electric currents ....... 



BLACKADDER'S Register thermometer described . . 

 Blind man, his feelings when first endowed with sight . 



Page 

 NEW. OPT. 6. OPT. INST. 10 



POP. INT. 



- 27, 28 

 3055 



MAGN. 



ELECT. MAGN. 

 NEW. OPT. 

 MAGN. 



MAGN. 



NEW. OPT. 

 OPT. INST. 



THEHM. 

 ELECT. 



THERM. 

 POP. INT. 

 THERM. 

 NEW. OPT. 

 ELECT. 

 GALV. . 



ELECT. 



MAGN. 

 ELECT. 

 POP. INT. 



ELECT. MAGN. 

 THERM. 

 POP. INT, 



3, 39 

 . 2,3 



33 

 6168 



. 6365 

 66 



. 67 

 68 



2 

 11 



60, 68, 70 

 7072 



93, 94 



3 



. 52 



47,48 



38,39 



19,21 



8 



38 



30 



6365 

 67 



15 



6667 



48,49 



. 9 



3639 



9 



13 

 19 



78, 79 



. 22 



13 



94 



38,39 

 80,81 



