The Project Gutenberg eBook of The Study of Elementary Electricity and Magnetism by Experiment., by Thomas M. St. John.

INDEX.

Numbers refer to paragraphs. See Table of Contents for the various experiments.

Abreast, arrangement of cells, 365.
Accumulators. (See storage cells.)
Action, local, 273.
Air, as insulator, 144, a.
Alternating currents, 443.
Amalgamating, 257, 274.
Amber, 107.
Ammeter, 353.
Ampere, the, 351, 357.
Ampere's rule, 386.
Annealing, 6.
Annunciators, 471.
Anode, 373, 378.
Applications of electricity, Chap. XXVII.
Arc lamp, 485.
Arrangement, of cells, 363 to 368.
Armature, the, 11, 78, 476.
Astatic needles, 251, 253, 254;
galvanoscope, 252, 256.
Atmospheric electricity, Chap. XIII., 217;
causes of, 221.
Attraction, mutual, 111;
and repulsion, laws of magnetic, 29;
electric, laws of, 121.
Aurora borealis, 223.
Batteries, Chap. XV.;
storage, 382.
Bell, electric, 468.
Bell telephone, 480.
Bichromate cell, 289.
Bound electrification, 162, 191.
Breaking a magnet, 51.
Bridge, Wheatstone's, 324 to 330.
Brushes, 476.
Buzzers, electric, 468.
Cable, submarine, as condenser, 182.
Capacity, inductive, 169;
electrical, 176, 178.
Carbon, transmitter, 482;
electroscope, 114.
Cathode, 373.
Cell, galvanic, Chap. XV.;
arrangement of, 363, 364, 365, 368;
chemical action in, 270, 271;
direction of current in, 268;
local action in, 273;
open and closed circuit, 286;
polarization of, 278;
poles of, 269;
simple, 275;
secondary, 382;
single-fluid, 275;
two-fluid, 281, 285;
various galvanic, 286 to 291.
Charge, in condenser, 195;
residual of condensers, 197.
Charging conductors, Chap. VIII.
Chemical action, 369.
Chemical effects of current, Chap. XXI.
Circuit, electric, 266;
divided, 293;
short, 295.
Coercive force, 44, 46.
Coils, 390;
induction, 473, 474;
method of joining, 408;
polarity of, 392;
resistance, 309;
simple resistance, 310.
Commutator, 476.
Compass, 26;
our, 32;
needle, 243, 249.
Compound magnets, 73.
Condensation of electrification, Chap. X., 178.
Condensers, 178;
action of, 186, 191;
induction coil, 181;
submarine cables, 182.
Conductive discharge, 149, 184.
Conductors, 126, 129, 133;
hollow and solid, 153;
and insulators, relation between, 133;
and non-conductors, 312.
Connections, electrical, 226 to 230.
Contact breaker, Exp. 195;
§ 466.
Convective discharge, 149.
Copper sulphate solution, 283.
Cores, of electromagnets, 397.
Coulomb, the, 354.
Current electricity, Part III.
Current, 144, a, 264;
detectors, 232, 239;
direction of in cell, 268;
direct and alternating, 443;
extra, 444;
interrupters, 466;
primary and secondary, 441;
measurement of, 352;
reverser, 235, 237;
strength of, Chap. XX., 350, 358, 362 to 365;
unit of, 351.
Daniell cell, 290.
Declination, 84.
Depolarizers, 280, 282.
Detectors, current, 232, 239.
Diamagnetic bodies, 15.
Dielectric, 184, 191, 195.
Dielectrics, 166.
Dip, 86.
Direct currents, 428, 443.
Dischargers, 188.
Discharges, kinds of, 149.
Divided circuits, 293, 323.
Dry cells, 288.
Dynamo, 435, 476.
Earth's magnetism, 83, 92, 93.
Electric, bells, 468;
chime, 193;
circuit, 266, Chap. XVI.;
current, 144, a, 264;
density, 155;
field, 156;
horse-power, 355;
lighting, 484;
machines, static, 216;
motor, 477;
polarization, 159;
resistance, Chap. XVIII.;
wind, 155.
Electricity, static, Part II.;
Current, Part III.;
Applications of, Chap. XXVII., 456;
kinds of, 100;
derivation of name, 107;
Atmospheric, Chap. XIII., 217.
Electrification, Chap. VI., 103, 116, 132, 134;
and heat, 104;
condensation of, Chap. X.;
escape of, 155;
free and bound, 162;
induced, Chap. IX.;
kinds of, 120;
of earth, 222;
source of in cells, 265;
theories about, 145;
two kinds of, 120, 211.
Electrics and non-electrics, 134.
Electrified bodies, 102, 107.
Electrodes, 269.
Electromagnetism, Chap. XXII., 383.
Electromagnets, Chap. XXIII., 396;
cores of, 397;
horseshoe, 405.
Electromotive force, 144, Chap. XVII., 296, 300, 303;
measurement of, Exp. 140;
of polarization, 373, 382;
series, 301;
unit of, 297.
Electrophorus, 138;
action of, 171, 172;
our, 139.
Electrolysis, 370.
Electrolyte, 370.
Electroplating, 376, 378.
Electroscope, action of, 206, 208;
carbon, 114;
pith-ball, 200;
our leaf, 201, 202.
Electroscopes, Chap. XI.
Electrotyping, 379.
Equator of magnet, 13.
Equipotential points, 326.
External resistance, 307, 368.
Extra current, 444;
Exp. 199.
Field, electric, 156;
magnetic, Chap. IV., 62, 80;
magnets, 476.
Figures, magnetic, 64;
permanent, 417.
Force, 103;
lines of magnetic, 64, 73, 80, 156;
lines of electric, 156;
lines of about a wire, 385.
Franklin, Benjamin, 218.
Free electrification, 162.
Frictional electricity, Part II.
Fulminating panes, 180.
Galvanic cells, Chap. XV., 265;
chemical action in, 270;
various kinds of, 286 to 291.
Galvanoscope, 240 to 249.
Glass, as insulator, 136.
Gold-leaf electroscope, 200, 209.
Gravity cell, 291.
Hardening steel, 8, 10.
Heat, effect on resistance, 343;
effect on magnet, 49.
Horse-power, electric, 355.
Horseshoe magnet, 11;
advantages of, 82;
electromagnets, 405.
Hydrogen, 260, 262, 271, 278, 279, 373.
Inclination of needle, 86.
Induced currents, Chap. XXV.;
and work, 429;
and lines of force, 432, 435, 438;
direction of, 439.
Induced magnetism, Chap. III.
Induction coils, 473;
action of, 474;
condensers of, 181;
with telephone, 483.
Induction, electromagnetic, 426;
laws of, 440;
static, theory of, 159;
successive, 168.
Inductive capacity, 169.
Insulators, Chap. VII., 125.
Internal resistance, 307, 314, 358, 362, 368.
Iron and steel, Chap. I.
Iron, hardening properties of,
Exp. 4;
impurities of, 1;
kinds of, 2;
soft, 10.
Jar, Leyden, 179.
Key, 233, 234.
Lamp, arc, 485;
incandescent, 486.
Laws, of electrification, 121;
of induction, 440;
of magnetism, 29;
of resistance, 349.
Leclanché cell, 287.
Leyden jar, 179.
Lighting, 484, 485, 486.
Lightning, 144, a; 218;
rods, 220.
Lines of force, about a wire, 385, 388;
electric, 156;
and induced currents, 432, 438;
magnetic, 64, 73, 74, 80, 156;
resistance to, 78, 397.
Local action, 273.
Local currents, 273.
Lodestone, 93.
Magnetic, bodies, 15;
circuits, closed, 420;
field, 62, 80;
figures, permanent, 417;
figures, 64, Exp. 161, 162, Exps. 168 to 171;
force, lines of, 64, 80, 156;
induction of the earth, 92;
needle, 26;
needles, balancing of, 88;
needle, dip of, 86;
problems, 33;
saturation, 42;
screens, 18;
tick, Exp. 160;
transparency, 18.
Magnetism, Part I.;
induced, Chap. III., 53;
residual, 44, 53;
temporary, 53;
terrestrial, Chap. V.;
theory of, 42;
of earth, 83;
laws of, 29.
Magnets, bar, 21;
compound, 73;
effect of breaking, 51;
equator of, 13, 51;
experimental, 407;
kinds of, 11;
natural, 93;
poles of, 13, 25;
practical uses of, 16.
Mercury, 274.
Motion, production of, Chap. XXVI., 445, 452, 455.
Motors, electric, 477.
Mutual attractions, 111.
Natural magnets, 93.
Needle, astatic, 251, 253, 254;
magnetic, 26, 32.
Negative electrification, 120.
Neutral bodies, 102.
Non-conductors, 312.
Non-electrics, 134.
North-seeking poles, 25.
Ohm, the, 308.
Ohm's law, 356.
One-fluid theory, 145.
Open and closed circuits, 266;
cells, 286.
Oxygen, 372, 373, 382.
Peltier effect, 424.
Pith-ball electroscope, 200.
Plates or elements, 267.
Polarization of cells, 278;
effects of, 279;
electric, 159, 164;
electromotive force of, 373;
magnetic, 56;
remedies for, 280.
Poles, 13, 25, 64, 92;
consequent, 39;
of coils, 392;
of electrodes, 269;
reversal of, 35;
rule for, 31.
Pole pieces, 56.
Positive electrification, 120.
Potential, 133,144;
energy, 103.
Primary current, 441.
Proof-plane, 209.
Quantity, unit of, 354.
Recorder, Exp. 197.
Relay, telegraph, 462.
Repulsion, laws of electrostatic, 121;
laws of magnetic, 29.
Residual, charge in condenser, 197;
magnetism, 44;
magnetism of core, Exp. 159.
Resistance, coils, 309;
effect of heat on, 343;
electrical, Chap. XVIII., 305, 319, 321;
external and internal, 307, 362, 368;
internal, 314, 358;
laws of, 349;
to lines of force, 78;
measurement of, Chap. XIX.;
unit of, 308.
Retentivity, 44, 46.
Reverser, current, 235, 237.
Rheostat, simple, 344.
Saturation, magnetic, 42.
Secondary cells, 382;
current, 441.
Self-induction, 444.
Series arrangement of cells, 364.
Shocks, 188.
Short circuits, 295.
Shunts, 293.
Silk, as insulator, 136.
Single-fluid cell, 275.
Single needle telegraph, Exp. 194.
Sounder, telegraph, 458.
Spark, 144, a.
Static electricity, Part II.
Static electric machines, 216.
Steel, Chap. I.;
kinds of, 2;
magnetism of, 42, 46, 49.
St. Elmo's fire, 222.
Storage cells, 382.
Successive, induction, 168;
condensation, 199.
Sulphuric acid, 258, 262, 314.
Tangent galvanometer, 352.
Telegraph, line, 459, 460;
relay, 462;
single needle instrument, Exp. 194;
sounder, 458;
static, 130.
Telephone, the, 479;
Bell, 480;
carbon transmitter, 482;
with induction coils, 483;
receiver, 481.
Tempering steel, 8.
Temporary magnetism, 53.
Terrestrial magnetism, Chap. V.
Thermoelectricity, Chap. XXIV., 423.
Thermopile, 425;
home-made, 421.
Thunder, 219.
Transformers, 475.
Transmitters, 480, 482.
Two-fluid cell, 280, 281;
care of, 282;
chemical action in, 285.
Two-fluid theory of electrification, 146.
Unit of, current strength, 351;
E. M. F., 297;
of power, 355;
quantity, 354;
resistance, 308.
Variation, angle of, 84.
Varieties of electricity, 100.
Volt, the, 297.
Voltameters, 297, 353, 380.
Water, composition of, 372.
Watt, the, 355.
Wheatstone's bridge, 324 to 330.
Wind, electric, 155.
Wire tables, Chap. XXVIII.
Yoke, use of, 406.
Zero, potential, 144, a.
Zinc, chemical action with, 271;
with commercial, 273.
Zinc plates, reasons for amalgamating, 274.

Notes.