None
Reactance, 329 Recalescence, 216 Reflection of electric waves, 343, 345, 354 ; of light from magnets, 293* Refractive index and dielectric con- stant, 351 Refraction, electric waves, 345 ; lines of induction (electric), 50 ; (magnetic), 199 Reluctance, magnetic, 283 Remanent magnetism, 207 Replenisher, 73 Repulsion between alternating cur- rents, 334 Residual, charge, 66 ; magnetism, 207 ; effect on dynamo-characteristic, 417 Resistance, 90, 112 ; absolute measure, 401, &c. ; alternating currents, 336 ; box, 375 ; battery, 378 ; combina- tions, 113 ; comparison, 374, &c. ; between parallel cylinders, 126 ; dimensions of, 398 ; multiple arc, 119 ; of sheet, 125 ; specific, 115 ; standard, 400, 405; temperature- coefficient, 115 ; unit, 114, 397 Resistance, magnetic. See Reluctance Resonator, electrical, 343 Retardation of current, 329; of mag- netisation, 210 Reversibility, of influence machines, 75 ; electrodynamic machines, 433 Riess's thermometer, 90 Righi, electric action of light, 485 Ring, Gramme's, 422 Ring magnet, closed, 191 i. ; with air- gap, 191 iii. Rontgen rays, source, properties, and theory, 483 ; electric action, 485 Root-mean-square (R.M.S.) current, 430 Rotating coil, 328, 329 ; with iron core, 333 Rotating fields, 335, 433 Rotary motors, 335, 433 Rotations, electromagnetic, 270, &c. Rotatory magnetic power, 290 Rowland, electric convection, 355, 411, 482 RuhmkorfF s coil. See Induction coil Rutherford, magnetic detector, 348 ; generation of radium and its pro- ducts, 484 SAUSSURE, potential of the air, 466 Savart. See Biot Schweigger'a multiplier, 251 Screens, electric, 48 ; electromagnetic, 327 ; magnetic, 204 Secondary batteries, 164 Seebeck, thermo-electric currents, 140 Self-inductance, 301 ; value in special cases, 302 ; measurement of, 385 Self-induction, 298; e.m.f. of, 330, 430 ; in parallel circuits, 323 ; work of equal zero, 430 Sensitiveness of galvanometer, 359 Shadow of the cross vacuum tube, 481 Shell, magnetic, 191 ii. ; equivalent to current, 255, 265 Shunts, 363 632 INDEX Siemens' continuous current machine, 428 ; electric furnace, 449 Signalling, rapidity of, 458 Spark, chemical effects of, 96 ; at break, 320 ; lengths of, 95 Sparking in dynamos, 425 Specific inductive capacity, 15, 64, 65 Spectrum, of arc, 444 ; of discharge, 94 Sphere, capacity of isolated, 53 ; electric force outside, 20 ; with volume charge, 21 ; in uniform field, 25 Standards, 400 Steam, electrical condensation of, 486 Stokes, theory of Kontgen rays, 483 ; velocity of falling drop, 486 Stoney, Johnstone, electrons, 490 Strength, electric, of dielectrics, 57, 95* Stresses in electric field, 10, 57 ; Quincke's experiments, 68 Striae, 94 Striking distance, 95 String galvanometer, 367* Sulphur, boiling point of, 465 Surface density, electric, 16, 17, 18 ; on cylinder, 24 ; on sphere in uni- form field, 25 Synchronous machines, 432 TANTALUM lamp, 443 Telegraph, electric, 453; air lines, 456 ; duplex, 454 ; submarine and subterranean, 457; use of con- densers, 455 ; wireless, 464 Telephone, Bell's, 461 ; effect of leak- age, 463 ; minimum current, 461 ; law of transmission of signals, 463 Temperature coefficient, mercury and german-silver resistances, 374. See also Tables, p. 621 Temperature, influence on dielectric coefficient, 65* ; on magnetisation, 216, 233 Terrestrial magnetism, chap. xxii. ; declination, 241 ; dip, 242 ; Gauss's theory, 246; field, 243; magnetisa- tion due to, 238 ; numerical values, 244 ; variations, 247 Thermodynamics, application to dielec- trics, 65* ; to thermo-electricity, 146 ; to galvanic cell, 163 Thermo-electricity, chap. xiv. Units, absolute, 389 ; ampere, 257, 397 ; coulomb, 39, 397 ; current, 110, 257, 397 ; dimensions of derived, 390 ; electric and magnetic, 392 ; electro- magnetic, 394, 398; electrostatic, 393, 398 ; farad, 397 ; fundamental (C.G.S.), 387, 396, 399 ; general con- siderations, 386 ; henry, 397 ; joule, 39, 397 ; magnetic moment and field, 187 ; mechanical, 391 ; prac- tical, 397, 399; quantity of electri- city, 15, 397; ratio of (v), 399; resistance, 90, 114, 397; volt, 39, 397 ; watt, 79, 397 Unit tubes, electric, 47; magnetic, 199 Uranium, radioactivity of, 484 «v" (ratio of units), 399, 406 ; meas- urement of, 407, &c. ; numerical value, 411 Variation, terrestrial magnetic, 171, 239, &c. Velocity of electric waves, along cable, 341 ; in air, 343 ; dependent on dielectric constant, 351 Velocity of ions, 157, 158 Velocity of light, 351, 411 Verdet's law, 291 Viscosity and conductivity of electro- lytes, 158 Volatilisation by discharge, 91 Volt (practical unit of electromotive force), 397 INDEX 633 Volta, condenser, 82 ; contact theory of cell, 100, 101 ; pile, 99 ; pistol, 95 Voltaic arc, 444 Voltameter, 156 Voss' machine, 77 WATER, anomalous dispersion in, 351 Water-dropping detector, 85, 466; machine, 74 Waterfalls, potential gradient near, 488 Water vapour, condensation of, 486 Watt (practical unit of power), 39, 79, 130, 397 Watt-meter, 368-370 Waves, electromagnetic, along cable, 341 ; along wires, 344, 346 ; diffrac- tion of, 345 ; plane, 343, 353 ; polari- sation, 345 ; quasi-optical properties, 350; reflection, 343, 345, 354; at interface of dielectrics, 354* ; refrac- tion, 345 Weber, absolute measurement of re- sistance, 401 ; electrodynamometer, 368 ; electromagnetic experiments, 259 ; inclinometer, 310 ; measure- ment of " v," 407 Wehnelt interrupter, 439 Welding, electrical, 450 Weston (or cadmium) cell, 382 Wheatstone's Bridge, 120*, 376, 385 ; wire form of, 377 Wiedemann galvanometer, 366 Wilson, C. 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