INDEX. 



437 



Electroscopes, Bennefs gold-leaf, 13, 



25 



Fechner's, 264 



Gaugairis discharging, 259 



Gilberts straw-needle, 12 



HankeVs, 264 



Henley" 's quadrant, 14 



Pith-ball, 2, 3 



Voltcts condensing, 71, 149 

 Electrostatics, 7, 233 

 Electrotyping, 420 

 Energy of charge of Leyden Jar, 270 



of electric current, 378 

 Equator, Magnetic, 78 

 Equipotential surfaces, 242, 310 (f) 



magnetic, 310 



Equivalents, electro-chemical, 212 

 Erg, the (unit of work), 255 

 Evaporation produces electrification, 

 63, 33 



discharge by, 223 



Everett, James D., on atmospheric 

 electricity, 307 



on exact reading of galvan- 

 ometer, 202 (footnote) ^ 



on intensity of magnetisation 



of earth, 313 



Expansion, electric, 273, 386 

 Extra-current (self-induced), 404 



FAILURE and exhaustion of batteries, 



160 



Fall of Potential along a wire, 263, 357 

 Farad, the (unit of capacity), 276, 323 

 Faraday, Michael, molecular theory 



of electricity, 6 

 chemical theory of cell, 166 

 dark discharge, 290 

 Diamagnetism, 339, 340, 344 

 discovered inductive capacity, 



21, 269, 271 



Discovery of magneto -induc- 

 tion, 391 



Electro-magnetic rotation, 375 

 experiment on dielectric polar- 

 isation, 272 



gauze-bag experiment, 31 

 hollow-cube experiment, 31 

 ice-pail experiment, 34 

 laws of electrolysis, 211, 214 

 Magnetic lines-of-force, 108, 402 

 on Arago's rotations, 401 

 on dissipation of charge, 291 

 on identity of different kinds of 



electricity, 217, 218, 286 

 Voltameter, 214 



Fa raday, Michael, M agne to - optic 



discovery, 387 

 predicted retardation in cables, 



274 

 FaurJs Secondary Battery (footnote), 



4i5 



FavrSs experiments on Heat of Cur- 

 rents, 368 



Fechner's electroscope, 264 

 Feddersen, W. t on electric oscilla- 

 tions, 296 



Ferromagnetic substances, 339 

 Field, magnetic, 105, 191, 312 

 Figures, magnetic (see Magnetic 



figures) 

 electric, 297 



Fire of St. Elmo, 302 (footnote) 

 Flame, currents of, 291 



diamagnetism of, 344 

 discharge by, 7, 291 

 produces electrification, 62 

 Fleming's Battery, 182 

 Fontana on electric expansion, 273 

 Force, electric, 155 (footnote), 241, 

 251* 252 

 magnetic, 83, 155 (footnote), 



325a 



electromotive, 155 

 Foucaulfs Regulator Lamp, 372 



Interrupter, 398 



Franklin, Benjamin, discovered 

 action of points, mentioned 

 in, 35 (c), 43. 302 

 cascade arrangement of Leyden 



Jars, 279 



Electric Chimes, 43 

 Electric Kite, 302 

 Electric portraits, 288 

 his charged pane of glass, 47 

 invents Lightning Conductors, 



.35 

 kills turkey by electric shock, 



226 

 One-fluid theory of Electricity, 



6 



on seat of charge, 55 

 theory of the Aurora, 309 

 " Free" electricity, 24, 149 (footnote) 

 Friction produces electrification, i, 10 

 i Frog's legs, contractions of, 148, 229 

 j Fromenfs Electromotor, 375 

 Fuze, electric, 286, 370 



Galvani, Aloysius^ observed move- 

 ments of frog's leg, 148 



