Font size

critical, 586, 587

defined, 282

dimensional formula of, 540

example of effect of, 283

expressed as a velocity, 541

internal, of cells, 294

measurement of, 328

joint, 293

laws of, 285, 286, 287, 288, 289

measurement of, 308

by drop of potential, 309, 310

by Wheatstone bridge, 317, 318,

319, 320, 321

of conductors in parallel, 293

of conductors in series, 286

of electrolytes, measurement of, 327

of voltmeter, 458, 459, 460, 461,

468

practical unit of, 284, 546

Siemen's unit of, 543

specific, 285, 288

temperature coefficient of, 289

variation with temperature, 285,

289

Resistance and capacity, 629

Resistance and inductance contrasted,

616

effect on alternating E. M. F.,

617

Resistance and inductance in parallel,

624

in series, 623

Resistance, inductance and capacity,

630

Resistances, arrangement of, in bridge,

315

measurable by bridge, 324

Resistance coils, 311

Resistivity, 292

INDEX

593

Resonance, 631, 632, 633, 697, 702,

706

with inductance and capacity in

parallel, 633

with inductance and capacity in

series, 632

Resonator, 694

tuning of, 697

Retentivity, 155

Reversible ratios, bridge with, 322

Reversibility of cells, 236

Revolving armature, alternators with,

641

Revolving field, alternators with, 642

Rheostat, 302, 513, 600

Right hand rule for deflection of

needle, 345

for direction of induced E. M. F.,

422

Ring transformer, 649

Ring wound armature, 566

Ring wound generator, 569

Rocker frame, 568

Rontgen rays, 678

Rotary converter, 653

Rotating coil, E. M. F. of, 552

in magnetic field, 551

production of current by, 553

Rotating field, production of, 664

Rotation of current by magnetic pole,

351

Rotation of motor, direction of, 604

Rotation of pole by current, 350

Rotor, 665

Rule for direction of field about wire

carrying current, 348

for direction of induced E. M. F.,

421, 422

for direction of motion of wire

carrying a current, 352

for deflection of needle by current,

345

for polarity of electro-magnet, 404

Salt, electrolysis of a, 224

Saturation, magnetic, 393

Schweigger's multiplier, 365

graphs, 678

Screen, magnetic, 113, 143

Second, mean solar, 9

Secondary cell, 237

elements of, 238

Seebeck's discoveries, 528

Selenium, 285

Self-excitation, methods of, 563

Self-induction, 432, 614

absolute unit of, 433

measure of, 433

practical unit of, 433, 434

Semicircular variation, 183

Sensitiveness of relay, 705

of telephone, 705

Separation of induced charges, 32

Series, thermo-electric, 528

Series generator, 563, 582

characteristic of, 585

Series grouping of cells, 335, 337

Series motor, 602

speed of, 603

Series motor for A. C., 659

Shape of electro-magnets, 407

Shell transformer, 649

Shells, magnetic, 369

Shifting of brushes, 570, 571, 598

Short circuit, 306

Shunt, ammeter, 465, 466

defined, 293

division of current by, 301

galvanometer, need of, 380

millivoltmeter, 475

switchboard, 466

universal, 381

Shunt generator, 563, 582, 587

characteristic, 587

Shunt motor, 599

control of speed, 600

Siberian oval, 170

Siemens, 543

Siemens' electro-dynamometer, 383

unit of resistance, 543

Silicon as detector, 705

Simple cell, 193

chemical action in, 195

dissociation theory applied to, 279

Sine galvanometer, 376

Sine law, 147

Single phase alternators, 640, 644

594

INDEX.

Single phase current, rectification of,

655

Slide wire bridge, 325

Slip rings, 642

Smashing point of incandescent lamp,

511

Solenoid, 385

effect of core on field, 390

equivalent to bar magnet, 386

intensity of field on axis, 387

variation of field with current, 389

Solution, magnetization favored by,

159

Solution tension, 278

Sounder, 412, 704

Spark plug, 438

Sparking, 572

Specific reluctance, 400

Specific resistance, 285, 288

Speed of series motor, 603

of shunt motor, 600

Spheres, two coalescing, 82

two united, 81

Spider, 565

Split ring, 556, 567

Standard cell, Clark's, 212

need of, 211

Weston's, 213

Standard wave length, 706

Star development of drum winding,

577

Star grouping, 647

Starting box, 601

Static transformer, 649, 656

Stator, 665

Storage battery, charging, 245, 246,

415, 582

charging from A. C., 655

defined, 237

Edison, 250

advantages, 253

charging, 252

reactions of, 251

uses of, 254

Storage battery plates, dimensions,

242

grouping of, 243

preparation of, 239

Storms, magnetic, 180

Strength of magnets, 125, 406

Sturgeon, 403

Substances, magnetic, 121

subject to electrolysis, 221

Surface density of charge, 41, 65, 66

Suspended coil galvanometer, 378

Switch, overload, 414

underload, 414, 582

Switchboards, 579, 580

Switchboard shunt, 465, 466

Symmer's theory of electricity, 27

Synchronous converter, 653

Synchronous motor, 660

operation of, 661

Table of dimensional formulae, 547

of magnetic elements, 175

wire, 295

Tangent galvanometer, 373, 546

measurement of current by, 374

principle of, 375

Tangent law, 146

Tantalum lamp, 507

Telegraph, electric, 411

Morse, 412

Telegraph system, American, 413

Telegraphy, wireless, 698

Telephone, 440

in wireless telegraphy, 705

operation of, 442

sensitiveness of, 705

Temperature, absolute, 256

Temperature of arc, 485

variation of resistance with, 289

Temperature coefficient of resistance,

289

Tension, solution, 278

vapor, 277

Terminology of electrolysis, Faraday's,

220

Terrella, Gilbert's, 110

Theory, dissociation, applied to sim-

ple cell, 279

Theory, dissociation, of Arrhenius,

268

Grotthus', 274

of attracted disc electrometer, 102

of earth's magnetism, 181

INDEX.

595

Theory, etc. Continued.

of electrolytic dissociation, extreme

scope of, 281

of magnetism, Ewing's, 153, 395

of quadrant electrometer, 104

Theories of electricity, 27

Thermometer, platinum, 290

Thermopile, 532

Thermo-couple, 528

Thermo-electric E. M. F., 528

Thermo-electric inversion, 529

Thomson, J. J., 681, 682, 683

Thomson, Sir William, see Kelvin

Thomson effect, 531

Thomson inclined coil instruments,

471

Thomson's proof of oscillatory dis-

charge, 687

Three wire system, 581

Thunder storm, explanation proposed,

82

Time, unit of, 9

Toepler's influence machine, 49

Torsion, law of, 52, 127

Torsion balance, Coulomb's, 52, 100,

127, 132

Tractive power of magnet, 406

Transformation of D. C. and A. C.,

648

Transformer, 431, 649

auto, 652

core, 649

Faraday's ring, 431

operation of, 650

ring, 649

shell, 649

static, 649, 656

step down, 431

step up, 431

Transformers, connection of, 651

use with A. C. instruments, 472

Transmission of power, electrical, 501,

502

Transmitter, Blake, 441

wireless, 700

Tri-phase alternator, 645, 646, 647

Tri-phase delta grouping, 646

Y connection, 647

Troubles of lead batteries, 247

Tube, Crookes', 670, 671, 672, 675,

676, 677, 678, 682

focusing, 678

Geissler, 670

Tubes of force, 62

Tungsten lamp, 507, 512

Tuning of coupled circuits, 702

of receiving circuits, 706

of resonator, 697

Turning moment of magnet, 149

Ultra-violet light, 680

Underload switch, 415, 582

Unit of capacity, practical, 95

of current, 536

absolute, 355, 536, 546

practical, 228, 307, 448, 546

of E. M. F., 537

absolute, 426, 537, 546

practical, 77, 427

of electric power, absolute, 496

commercial, 496

practical, 496

of electric work, commercial, 496

of force, 11

of heat, 11, 478

of length, 7

of mass, 8

of quantity, 536

practical, 228

of resistance, absolute, 427, 546

practical, 284, 546

Siemens', 543

of self-induction, absolute, 433

practical, 433, 434

of time, 9

of work, 11

Units, absolute, 11

electro-magnetic, 535

primary, 538

electro-static, 535

fundamental, 3

Unit charge, lines of force from, 63

Unit electric field, 58, 61

Unit jars, 99

Unit magnet pole, 133

Unit quantity of electricity, 56

Universal shunt, 381

596

INDEX.

Use of electro-magnets, 408

of storage batteries, 254

Useful volts, 305

Vacua, discharge through high, 670

through moderate, 668

Value of alternating current, 612, 613

Value of electro-magnet, 405

Van't Hoff's generalization, 266

exceptions to, 267

Vapor tension, 277

Variation, magnetic, 169

Variation of magnetic elements, 176

of osmotic pressure, 263, 264, 265,

266

semicircular, 183

Vector diagram, 610

Velocity, resistance expressed as a, 541

of corpuscles, 683

of propagation of electric wave, 693,

694

Versorium, 16

Vibration, loss of magnetization facili-

tated by, 157

magnetization facilitated by, 156

Virtual amperes and volts, 612

Volt, 77, 78, 427, 537, 545, 546

denned, 307, 427, 545, 546

international, 212

Volts, lost and useful, 305

virtual, 612

Volta, 35, 186, 187, 188, 190, 191, 218

Volta's circlet of cups, 191

contact series, 187

contact theory, 188

investigations, 186

Voltaic cell, requirements of, 200

Voltaic pile, 190

Voltameter, 227

Voltmeter, 455, 458, 459, 460, 468,

470, 471, 472

connection of, 458, 459

measurement of E. M. F. by, 460,

461

reading across counter E. M. F., 595

resistance of, 458, 459, 460, 461, 468

Weston D. C., 468

Weston D. C. A. C., 470

Voltmeters classified, 462

Water, decomposition of, 218

electrolysis of, 219

Watt, 493

Watt, the, 496

Wattmeter, indicating, 499

integrating, 500

recording, 499, 500

Waves, electric, 690, 694

length of, 696, 702

velocity of propagation, 693

Wave length, standard, 706

Wave meter, 706

Wave winding, 575

Weber, 153

Weber's electro-dynamometer, 382

Weights, lifting by electro-magnets,

409

Welding, electric, 484

Weston A. C. ammeter, 467

D. C. voltmeter, 468

D. C. A. C. voltmeter, 470

standard cell, 213

Wheatstone bridge, arrangement of

resistances, 315

evolution in form, 316

measurement of resistances by, 317,

318, 319, 320, 321

principle of, 313, 314

Whirl, electric, 44

Wind, electric, 42, 44, 48, 49, 50

Wire carrying a current not a magnet,

349

Wire, circular measure of, 296

Wires, electric heating of, 480, 481

Wire gauges, 295

Wire tables, 295

Wireless telegraphy, 698

condition affecting, 707

distance attained by, 707

Work done by electric current, 47

Work in moving coil across field, 358

in moving conductor across field, 357

Work, unit of, 11

electric, commercial unit of, 496

X rays, 678, 679, 680, 684

Y connection, 647

Yoke, 561

Zincite as detector, 705

UNIVERSITY OF CALIFORNIA LIBRARY

BERKELEY

Return to desk from which borrowed.

This book is DUE on the last date stamped below.

MAY 6 1948

'53

v J

LD 21-100m-9,'47(A5702sl6)476

YC ! 1 270

defined, 282

dimensional formula of, 540

example of effect of, 283

expressed as a velocity, 541

internal, of cells, 294

measurement of, 328

joint, 293

laws of, 285, 286, 287, 288, 289

measurement of, 308

by drop of potential, 309, 310

by Wheatstone bridge, 317, 318,

319, 320, 321

of conductors in parallel, 293

of conductors in series, 286

of electrolytes, measurement of, 327

of voltmeter, 458, 459, 460, 461,

468

practical unit of, 284, 546

Siemen's unit of, 543

specific, 285, 288

temperature coefficient of, 289

variation with temperature, 285,

289

Resistance and capacity, 629

Resistance and inductance contrasted,

616

effect on alternating E. M. F.,

617

Resistance and inductance in parallel,

624

in series, 623

Resistance, inductance and capacity,

630

Resistances, arrangement of, in bridge,

315

measurable by bridge, 324

Resistance coils, 311

Resistivity, 292

INDEX

593

Resonance, 631, 632, 633, 697, 702,

706

with inductance and capacity in

parallel, 633

with inductance and capacity in

series, 632

Resonator, 694

tuning of, 697

Retentivity, 155

Reversible ratios, bridge with, 322

Reversibility of cells, 236

Revolving armature, alternators with,

641

Revolving field, alternators with, 642

Rheostat, 302, 513, 600

Right hand rule for deflection of

needle, 345

for direction of induced E. M. F.,

422

Ring transformer, 649

Ring wound armature, 566

Ring wound generator, 569

Rocker frame, 568

Rontgen rays, 678

Rotary converter, 653

Rotating coil, E. M. F. of, 552

in magnetic field, 551

production of current by, 553

Rotating field, production of, 664

Rotation of current by magnetic pole,

351

Rotation of motor, direction of, 604

Rotation of pole by current, 350

Rotor, 665

Rule for direction of field about wire

carrying current, 348

for direction of induced E. M. F.,

421, 422

for direction of motion of wire

carrying a current, 352

for deflection of needle by current,

345

for polarity of electro-magnet, 404

Salt, electrolysis of a, 224

Saturation, magnetic, 393

Schweigger's multiplier, 365

graphs, 678

Screen, magnetic, 113, 143

Second, mean solar, 9

Secondary cell, 237

elements of, 238

Seebeck's discoveries, 528

Selenium, 285

Self-excitation, methods of, 563

Self-induction, 432, 614

absolute unit of, 433

measure of, 433

practical unit of, 433, 434

Semicircular variation, 183

Sensitiveness of relay, 705

of telephone, 705

Separation of induced charges, 32

Series, thermo-electric, 528

Series generator, 563, 582

characteristic of, 585

Series grouping of cells, 335, 337

Series motor, 602

speed of, 603

Series motor for A. C., 659

Shape of electro-magnets, 407

Shell transformer, 649

Shells, magnetic, 369

Shifting of brushes, 570, 571, 598

Short circuit, 306

Shunt, ammeter, 465, 466

defined, 293

division of current by, 301

galvanometer, need of, 380

millivoltmeter, 475

switchboard, 466

universal, 381

Shunt generator, 563, 582, 587

characteristic, 587

Shunt motor, 599

control of speed, 600

Siberian oval, 170

Siemens, 543

Siemens' electro-dynamometer, 383

unit of resistance, 543

Silicon as detector, 705

Simple cell, 193

chemical action in, 195

dissociation theory applied to, 279

Sine galvanometer, 376

Sine law, 147

Single phase alternators, 640, 644

594

INDEX.

Single phase current, rectification of,

655

Slide wire bridge, 325

Slip rings, 642

Smashing point of incandescent lamp,

511

Solenoid, 385

effect of core on field, 390

equivalent to bar magnet, 386

intensity of field on axis, 387

variation of field with current, 389

Solution, magnetization favored by,

159

Solution tension, 278

Sounder, 412, 704

Spark plug, 438

Sparking, 572

Specific reluctance, 400

Specific resistance, 285, 288

Speed of series motor, 603

of shunt motor, 600

Spheres, two coalescing, 82

two united, 81

Spider, 565

Split ring, 556, 567

Standard cell, Clark's, 212

need of, 211

Weston's, 213

Standard wave length, 706

Star development of drum winding,

577

Star grouping, 647

Starting box, 601

Static transformer, 649, 656

Stator, 665

Storage battery, charging, 245, 246,

415, 582

charging from A. C., 655

defined, 237

Edison, 250

advantages, 253

charging, 252

reactions of, 251

uses of, 254

Storage battery plates, dimensions,

242

grouping of, 243

preparation of, 239

Storms, magnetic, 180

Strength of magnets, 125, 406

Sturgeon, 403

Substances, magnetic, 121

subject to electrolysis, 221

Surface density of charge, 41, 65, 66

Suspended coil galvanometer, 378

Switch, overload, 414

underload, 414, 582

Switchboards, 579, 580

Switchboard shunt, 465, 466

Symmer's theory of electricity, 27

Synchronous converter, 653

Synchronous motor, 660

operation of, 661

Table of dimensional formulae, 547

of magnetic elements, 175

wire, 295

Tangent galvanometer, 373, 546

measurement of current by, 374

principle of, 375

Tangent law, 146

Tantalum lamp, 507

Telegraph, electric, 411

Morse, 412

Telegraph system, American, 413

Telegraphy, wireless, 698

Telephone, 440

in wireless telegraphy, 705

operation of, 442

sensitiveness of, 705

Temperature, absolute, 256

Temperature of arc, 485

variation of resistance with, 289

Temperature coefficient of resistance,

289

Tension, solution, 278

vapor, 277

Terminology of electrolysis, Faraday's,

220

Terrella, Gilbert's, 110

Theory, dissociation, applied to sim-

ple cell, 279

Theory, dissociation, of Arrhenius,

268

Grotthus', 274

of attracted disc electrometer, 102

of earth's magnetism, 181

INDEX.

595

Theory, etc. Continued.

of electrolytic dissociation, extreme

scope of, 281

of magnetism, Ewing's, 153, 395

of quadrant electrometer, 104

Theories of electricity, 27

Thermometer, platinum, 290

Thermopile, 532

Thermo-couple, 528

Thermo-electric E. M. F., 528

Thermo-electric inversion, 529

Thomson, J. J., 681, 682, 683

Thomson, Sir William, see Kelvin

Thomson effect, 531

Thomson inclined coil instruments,

471

Thomson's proof of oscillatory dis-

charge, 687

Three wire system, 581

Thunder storm, explanation proposed,

82

Time, unit of, 9

Toepler's influence machine, 49

Torsion, law of, 52, 127

Torsion balance, Coulomb's, 52, 100,

127, 132

Tractive power of magnet, 406

Transformation of D. C. and A. C.,

648

Transformer, 431, 649

auto, 652

core, 649

Faraday's ring, 431

operation of, 650

ring, 649

shell, 649

static, 649, 656

step down, 431

step up, 431

Transformers, connection of, 651

use with A. C. instruments, 472

Transmission of power, electrical, 501,

502

Transmitter, Blake, 441

wireless, 700

Tri-phase alternator, 645, 646, 647

Tri-phase delta grouping, 646

Y connection, 647

Troubles of lead batteries, 247

Tube, Crookes', 670, 671, 672, 675,

676, 677, 678, 682

focusing, 678

Geissler, 670

Tubes of force, 62

Tungsten lamp, 507, 512

Tuning of coupled circuits, 702

of receiving circuits, 706

of resonator, 697

Turning moment of magnet, 149

Ultra-violet light, 680

Underload switch, 415, 582

Unit of capacity, practical, 95

of current, 536

absolute, 355, 536, 546

practical, 228, 307, 448, 546

of E. M. F., 537

absolute, 426, 537, 546

practical, 77, 427

of electric power, absolute, 496

commercial, 496

practical, 496

of electric work, commercial, 496

of force, 11

of heat, 11, 478

of length, 7

of mass, 8

of quantity, 536

practical, 228

of resistance, absolute, 427, 546

practical, 284, 546

Siemens', 543

of self-induction, absolute, 433

practical, 433, 434

of time, 9

of work, 11

Units, absolute, 11

electro-magnetic, 535

primary, 538

electro-static, 535

fundamental, 3

Unit charge, lines of force from, 63

Unit electric field, 58, 61

Unit jars, 99

Unit magnet pole, 133

Unit quantity of electricity, 56

Universal shunt, 381

596

INDEX.

Use of electro-magnets, 408

of storage batteries, 254

Useful volts, 305

Vacua, discharge through high, 670

through moderate, 668

Value of alternating current, 612, 613

Value of electro-magnet, 405

Van't Hoff's generalization, 266

exceptions to, 267

Vapor tension, 277

Variation, magnetic, 169

Variation of magnetic elements, 176

of osmotic pressure, 263, 264, 265,

266

semicircular, 183

Vector diagram, 610

Velocity, resistance expressed as a, 541

of corpuscles, 683

of propagation of electric wave, 693,

694

Versorium, 16

Vibration, loss of magnetization facili-

tated by, 157

magnetization facilitated by, 156

Virtual amperes and volts, 612

Volt, 77, 78, 427, 537, 545, 546

denned, 307, 427, 545, 546

international, 212

Volts, lost and useful, 305

virtual, 612

Volta, 35, 186, 187, 188, 190, 191, 218

Volta's circlet of cups, 191

contact series, 187

contact theory, 188

investigations, 186

Voltaic cell, requirements of, 200

Voltaic pile, 190

Voltameter, 227

Voltmeter, 455, 458, 459, 460, 468,

470, 471, 472

connection of, 458, 459

measurement of E. M. F. by, 460,

461

reading across counter E. M. F., 595

resistance of, 458, 459, 460, 461, 468

Weston D. C., 468

Weston D. C. A. C., 470

Voltmeters classified, 462

Water, decomposition of, 218

electrolysis of, 219

Watt, 493

Watt, the, 496

Wattmeter, indicating, 499

integrating, 500

recording, 499, 500

Waves, electric, 690, 694

length of, 696, 702

velocity of propagation, 693

Wave length, standard, 706

Wave meter, 706

Wave winding, 575

Weber, 153

Weber's electro-dynamometer, 382

Weights, lifting by electro-magnets,

409

Welding, electric, 484

Weston A. C. ammeter, 467

D. C. voltmeter, 468

D. C. A. C. voltmeter, 470

standard cell, 213

Wheatstone bridge, arrangement of

resistances, 315

evolution in form, 316

measurement of resistances by, 317,

318, 319, 320, 321

principle of, 313, 314

Whirl, electric, 44

Wind, electric, 42, 44, 48, 49, 50

Wire carrying a current not a magnet,

349

Wire, circular measure of, 296

Wires, electric heating of, 480, 481

Wire gauges, 295

Wire tables, 295

Wireless telegraphy, 698

condition affecting, 707

distance attained by, 707

Work done by electric current, 47

Work in moving coil across field, 358

in moving conductor across field, 357

Work, unit of, 11

electric, commercial unit of, 496

X rays, 678, 679, 680, 684

Y connection, 647

Yoke, 561

Zincite as detector, 705

UNIVERSITY OF CALIFORNIA LIBRARY

BERKELEY

Return to desk from which borrowed.

This book is DUE on the last date stamped below.

MAY 6 1948

'53

v J

LD 21-100m-9,'47(A5702sl6)476

YC ! 1 270

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46