32 



GENERAL INDEX 



Local attraction, consequence of, in the wreck of vessels 

 Barlow's proposed remedy for . 

 chronometers disturbed by . . . 



London Institution, galvanic battery belonging to 



Longitude, method of finding from the eclipses of Jupiter's 

 satellites ........ 



Lucernal microscope, account of . . . . 



Luminous effects of galvanism described . . . 



MA CHINE s } considerations with regard to . - . 



effect upon, of the medium in which they are 

 worked ......... 



electric. [See Electric Machines.'] 



Magic- Lantern, principles and construction of . 



Magnet, revolution of one of its poles round a vertical wire 

 . . made to revolve round its axis ... 



voltaic, description of ..... 



made to show the phenomena of the dipping- 

 needle ........ 



method of making a very powerful temporary one 

 one which sustained 750 pounds . . . 



Newton's small one, which raised 250 times its own 

 weight ...... 



either pole of, tends to produce opposite polarity in 

 the adjacent end of a neighbouring magnetizable body 

 Magnets, native, or loadstones, where found 



artificial, ready method of forming . 

 . . . . various methods of forming ... 



. . . method of forming by percussion . 



by juxtaposition 



less tenacious of their virtue than load- 

 stones ......... 



general principles of 

 impaired or destroyed by heat 

 impaired by falling on a stone pavement . , 

 experiments on their fracture . . 



lose their power by rubbing .... 



. . on the preservation of . . . . . 



polarity of, and other properties described and illus- 



MAGN. 



GAI.V. 

 POP. INT. 



OPT. INST. 

 GALV. 



POP. INT. 



OPT. INST. . 

 ELECT. MAGN. 



MAGN. 



trated 



horse-shoe, formation of .... 



Magnetism^ definition of . , r . . . 



general facts and principles of ... 



(induced) rendered permanent by the electric dis- 



MAGN. 



charge 



tures 



globe 



not impaired by cold, however intense . 



of iron, experiments on . 



terrestrial, concerning .... 



variations in its intensity . . 



hypothesis concerning 



different theories of ..... 

 mechanical theory of ' . . . 

 of steel bars retained and concentrated by arma- 



of bodies which are not ferruginous 



all bodies in some degree susceptible of . 



of rotation, various experiments on . . 



excitable only by induction .... 



induction of, explained in Ampere's theory 



and electricity identical ..... 



terrestrial, exhibited by means of an artificial 



influence of light upon 

 Magnetic theories, observations on 



attraction and repulsion, similar to electric . 

 attraction, opinions of the ancients concerning 

 fluids, theory of two .... 



Brewster's theory respecting 

 forces, laws of 



ELECT. MAGN. 



MAGN. 



Paee 

 66 

 67 

 68 



. 4 

 52,53 



. 52 

 10 



. 20 

 29 



. 52 



1923 



23,24 



38 



47 



. 54 

 55 



. 88 

 1 



. 'i 



1015 



42 

 43 



54 

 41 

 12 

 12 



15, 16 

 54 

 53 



13 



53 



1 



116 



12 

 13 

 14 



2232 

 25 

 25 



3241 

 32,33 



43 

 8791 



90 



9196 

 2 



87 

 . 92 



97, 98 

 96 

 3,39 >, 



33 



36-41 



41 



16 2L 



