INDEX 



Induction by electric cha 

 machine 

 magnetic 

 magnetisation by. 

 within a magnetised bod 

 Influence machines, 16 

 Insolation, 3 

 Intensity, direction and magnitude of at 



any point in magnetic field, 220 

 of field of a bar magnet, 211 

 of field, representation by lines of 



force, 37 

 Inverse square law, general consequences 



of, 31 



square law of electric force, 61 

 square law of electric force, Cou- 

 lomb's proof, 65 

 square law of electric strain, 53 

 square law of magnetic force, Cou- 

 lomb's proof, 208 

 square law of magnetic force, 



Gauss's proof, 212 

 square law gives force on a small 



charged body, 67 

 Investigation of field, note on, 68 

 Iron filings for mapping field of magnet, 



177 

 Isogonic linen, 



vm replenisher 



Quadrant electrometer, 87 



theory of pyroelectricity, 150 

 Kcrr electric effect, 144 



magnetic effect, 335 

 Kew magnetometer, 

 Kundl'sexperiments with pyroelectricity, 



;EVIN'B form of Electron Theory of 

 Magnetism, 297 

 Leyden Jar. Capacity of, 96 

 Jar, charging, 21 

 Jar. discharge, 21 

 Jar, rate of fall of potential in, 1 1 7 

 Level surface.". 

 Light and Magnetism, 320 

 Lightning conductors, 13 

 Lines and tubes of force, 67 



and tubes of induction in air (mag- 

 netism), 231 

 of force as measure of intensity of 



flel 



of force, effect of insertion of in- 

 finitely thin metal plate, 80 

 of force in electric field, 32 

 of force in magnetic field. 1 77 

 of force in magnetic field, mapping 



by iron filings, 177 

 of force of earth, direction of, 301 

 or tubes of electric strait 

 Lippmann's theory of electric deforma- 

 tion of crystals, 1 57 



Liquid dielectrics, Quincke's experiments 

 with, 138 



Liquids, as para- or diamagnetics, 204 

 electric expansion of, 143 

 magnetic double refraction in, 334 

 magnetic properties of (Pascal), 296 



L^rentz's theory of Zeeman effect, 337 



MAGNET, axis and centre of, 215 



consequent poles in, 174 



earth as a, 169 



moment of, 215 



situation of magnetisation in, 174 



saturation of, 175 

 Magnetic double refraction, 333 



field, 176 



field, lines of force in, 177 



fields, some special, 219 



hysteresis, 183 



induction, 229 



intensity, 211 



measurements, founded on inverse 

 square law, 209 



recording instruments, 312 



permeability, 235 



poles, 315 



shell, field of, -J-JL 



shell, potential of, 222 



susceptibility, 239 

 Magnetisation and temperature, 186, 200 



and the magnetising force producing 

 it, 181 



by divided touch, 171 



by double touch, 172 



by single touch, 171 



by induction, 180 



Calculation of induced, 249 



Change of Length on, 188 



Distribution of, 174 



Effect of hammering on, 194 



Electro-magnetic, method of, 173 



Induced, 168 



Methods of, 170 



of iron in very strong fields, 274 



of iron in very weak fields, 273 



situation of, in magnet, 174 

 Magnetised bodies, forces on, 253 et scq. 



sphere, field due to, 226 

 Magnetism and light, 320 



Electron theory of, 297 



molecular hypothesis of, 192 



terrestrial, 301 

 Magnetometer, Kew, 303 



method of measurement of permea- 

 bility by, 266 

 Magneton, 299 

 Magnets, ball ended, 174 



compound, 174 



constitution of molecular, 201 



electro, 173 



fields, of, 178 



horseshoe, 174 

 natural, 165 



nickel and cobalt, 176 

 portative force of, 175 



preservation of, 175. 



