Beccaria, Father G., on atmospheric | Callan's Battery, 172 electricity, 306 Becquerel, Antoine Cesar, on atmo- Becquerel, Henri, on magneto-optic Bell, Alexander Graham, his Tele- The Photophone, 389 Bells, electric, 432 Bennet's Doubler, 23 Electroscope, 13, 25 Bertsch's Electric Machine, 45 Law of magnetic distribution, on atmospheric electricity, 307 Blasting by electricity, 286, 370 "Bound" electricity, 24, 149 foot- Boltzmann, on Dielectric capacity, Callaud's Battery, 176 Canton, John, discovers Electrostatic on Electric Amalgam, 41 Candle, electric, 373 of accumulator or condenser, of conductor, 37, 47, 247, 277 specific inductive, 21, 49, 268, 272 unit of (electrostatic), 247 Capillary Electrometer, 225, 265 Carré, F., Dielectric machine, 45 on magnets of cast metal, 97 his pith-ball electroscope, 3 on atmospheric electricity, 302, Cavendish, Hon. H., on Specific Ceca, Father, on atmospheric elec- Cell, voltaic, 152 Charge, electric, 7 resides on surface, 27 residual of Leyden Jar, 53, 272 of spark discharge, 286 outside the battery, 205, 412 | Chimes, electric, 43 Chronograph, electric, 433 Circuit, 152 simple and compound, 181 CABLE, Atlantic, 274 (footnote), 275, Clark's (Latimer) standard cell, 177 Clausius, R., theory of Electrolysis, Cleavage, electrification by, 60 Cobalt, magnetism of, 86 Coefficient of Magnetic induction, 89. Conductivity, 158, 346, 348 Curves, magnetic (see Magnetic Cuthbertson's Electric machine, 38, Cylinder Electrical machine, 39 D DAILY variations of magnet, 142 discovers electric light, 371 De Haldat, magnetic writing, III Conductors and Non-conductors, 8, 27 De la Rive's Floating Battery, 194 Consequent Poles, 104, 109 Contact Electricity, 71, 149 Continuous electrophorus, 23, 45 Cumming's phenomenon, 382 De la Rue, Chloride of Silver Battery, 174, 291 on electrotyping, 420 Deflections, method of, 118, 123, 325a of flames, 344 Dielectrics, 8, 49, 270 Differential Galvanometer, 203 variation of, 141 Cuneus' discovery of Leyden Jar, 52 Diplex signalling, 428 Current, effects due to, 153 Current Electricity, 147 strength of, 158, 179 unit of, 196 Current-reverser (see Commutator) Curvature affects surface-density, 35, 249 Dipping Needle, 137 Discharge affected by magnet, 294 brush, 43 by evaporation, 223 Discharge affected by points, 43, 290, | Electric Egg, the, 292 302 effects of, 43, 284, 286 glow, 290, 302 (footnote) sensitive state of, 294 velocity of, 296 Discharger, Discharging-tongs, Universal, 54 51 Disruption produces electrification, 60 Dissectable Leyden Jar, 55 Dissipation of Charge, 299 Distillation, electric, 223 Distribution of Electricity, 28, 35, 248, 249 of Current, 240 of Magnetism, 104, 122 Divided Circuit, 353 Touch, 93 Dolbear's Telephone, 436 Doubler, 23, 45 Double Touch, 94 Dry-Pile, 182, 264 Duboscq's Lamp, 372 Du Fay's experiments, 4, 27 Duplex Telegraphy, 275, 428 Duration of Spark, 296 Duter on Electric Expansion, 273 Dynamic Electricity (see Current Electricity) Expansion, 273 Force, 155 (footnote), 241 Electricity, theories of, 6, 300 Electrodes, 207 unpolarisable, 231 Electrodynamics, 331 Electrodynamometer, 336,378 (bis.) laws of, 211, 414, 417 of copper sulphate, 209 Electrolytes, 207, 417 Electrolytic convection, 418 Electromagnets, 98, 326 laws of, 328 Electromagnetic engines (motors), 375 Electromagnetic theory of Light, 390 Electromagnetism, 326 Electrometallurgy, 419 Electrometer, absolute, 261 attracted-disc, 261 quadrant (Sir W. Thomson's), 262 repulsion, 260 trap-door, 261 Electromotive-force, 155 measurement of, 360 Electromotors, 375 Electro-Optics, 385 Electrophorus, 22 continuous, 23, 45 Electroplating, 421 Electroscopes, II (Frictional) machines, 39 Bohnenberger's, 13, 264 Electroscopes, Bennet's gold-leaf, 13, | Faraday, Michael, Magneto-optic Gilbert's straw-needle, Henley's quadrant, 14 Pith-ball, 2, 3 12 Volta's condensing, 71, 149 Electrostatics, 7, 233 Electrotyping, 420 discovery, 387 predicted retardation in cables, Favre's experiments on Heat of Cur- Fechner's electroscope, 264. Feddersen, W., on electric oscilla- Energy of charge of Leyden Jar, 270 Ferromagnetic substances, 339 of electric current, 378 Equator, Magnetic, 78 Equivalents, electro-chemical, 212 Everett, James D., on atmospheric on exact reading of galvan- F FAILURE and exhaustion of batteries, Fall of Potential along a wire, 263, 357 chemical theory of cell, 166 Discovery of magneto-induc- gauze-bag experiment, 31 Field, magnetic, 105, 191, 312 Fire of St. Elmo, 302 (footnote) diamagnetism of, 344 Fontana on electric expansion, 273 251, 252 Galvani, Aloysius, on preparation of Gilding by Electricity, 431 frog's limbs, 229 on Animal Electricity, 231 Electricity (see Current Elec- Taste, 227 Galvanism (see Current Electricity) absolute, 200 astatic, 198, 231 ballistic, 204 constant of, 200 Du Bois Reymond's, 231 reflecting (Sir W. Thomson's), sine, 201 tangent, 199 Galvanoplastic (see Electrotyping) Globular lightning, 304 Glow Discharge, 290, 302 (footnote) Gold-leaf Electroscope (see Electro- Gordon, J. E. H., on magneto-optic on dielectric capacity, 270, 271 dielectric stress, 272 local, at electrodes, 417 Helmholtz, Hermann L. F., on Henry, 405 Joseph, "sounder," 423 invented the |