Laminated magnets, 95 



Law of Inverse squares, 16, 117, 235, 



Leakage, rate of, 299 

 Leclanchfs Battery, 173 



e faillif on diamagnetism of 

 _ antimony, 339 



atmospheric 



Length of spark, 291 

 Lenz's Law, 396 



alcohol calorimeter, 367 

 Leydenjar(see/^) 

 Lzchtenbergs figures, 297 

 Lifting-power of magnets, 103 



of electromagnets, 330 

 Light affects resistance, 389 



Electric, 371 



Electromagnetic theory of, 365, 



polarised, rotated by magnet, 



Lightning, 9, 302, 304 



conductors, 32, 305 

 T d^ation of, 296, 304 

 Lmes-of-force, electric, 243 



due to currents, 191, 327 ^A 

 T vui ma S netic > 89, 108, 310, 312 



meterlS 26 Capillary Electr <> 

 Liquids as conductors, 205 

 M resistance of, 348 



Local Action " in hatf-*ri/*e /c 

 f j nv**\/u iu Utttceries, 101 



.Lodestone, 76, 340 



" Long-coil " instruments, 352 



Loss of Charge, 299 



Louis XV. electrifies 700 monks, 226 



J^uutn s experiment, 285 



Luminous effects of spark, 289, 400 



MACHINE, Electric, 38 



convection-induction, 45 

 cylinder, 39 



dynamo-electric, 408 



ffoltz's, 46 



hydro-electrical, 44 



invention of, 38 



magneto-electric, 407 



plate, 44 



Winter's, 40 



Magne-crystallic action, 34, 

 Magnet, breaking a, 106 

 Magnets, natural and artificial, 76, 



Magnetic actions of current, 184, 8 

 3 2 6, 327, 334 



Magnetic attraction and repulsion, 8 



no 



cage, 84 

 curves, I0 8, i 9I 

 field, 105, i 9I , 3I2 3 

 figures, 108, I09 , 110,191 



." theory of, 126 

 fluids, alleged, 91 

 force, 8 3 , 3 i (e) 

 >, measurement of, XI 



induction, 89 



>, coefficient of, 342 

 iron ore, 76 



lines<>f-force, 89, 108, 109, n< 



Hnes-of-force of current, 19 



320, 327 

 maps, 139 

 meridian, 136 

 metals, 86, 339 

 moment, 123 (footnote), 313 



needle, 79, 134 



oxide of iron, 76, 172 (footnote 



paradox, a, 128 



pole, unit, 125 



potential, 310, 314, 3I5 



proof-plane, 402 



saturation, 102 



Beetz, on, 115 (foot- 

 note), 328 (e) 

 screen, 84 



shell, 107, 192, 311 () 

 ,, force due to, 127 

 potential due to, 127, q T1 - 

 storms, 145, 309 

 substances, 85, 339 

 units, 321 

 writing, in 



Magnetisation, coefficient of 80 o t o 

 34? 



intensity of, 313 

 lamellar, 107 



mechanical effects of, 113 

 methods of, 92-98, 326 

 solenoidal, 107 

 sound of, 113, 434 

 time needed for, 324 (e) 

 Magnetism, 76 



action of, on light, 114, 387 

 caused by heat, 98 

 destruction of, 99 

 distribution of, 104 

 of gases, 339, 387 

 lamellar, 107 

 laws of, 8r, n6, 310 

 permanent, 90, 313 

 residual, 102 



