None
38 Potential contact, 40 contact, theory of, 40 difference, electric, 11 difference, magnetic, 152 electric, definition, 12 electrode, table, 58 energy, 7 magnetic, definition, 143 Potentiometers direct-current, 615 null tjrpes, 615 precision, 615 principle of, 615 uses, 666 Poulsen's arc system, 819 Power alternating current, definition, 365, 478 component, definition, 368 conversion factors, 18, 19 definition, 9 electric, definition, 17 limiting reactances, 406 required, see name of apparatus of sine-wave current and volt- age, 365 three-phase, measurement, 38? two-wattmeter method, 389 Power factor angle, definition, 368 definition, 368, 478 measurement by w^attmeter, 389 for sine-wave current and volt- age, 389 (see also name of apparatus) Precision, of instruments, see name of instrument Pressboard, 38 Primary batteries, see Batteries, Primary Prime movers, pulsation in, 481 variation in, definition, 481 Prony brake test, motors, 528 Protective reactances, see React- ance Coils Pulsating current, definition, 475 Pulsation, in prime movers, defi- nition, 481 Index 85? Puncturing voltage, see Dielectric strength Quadrant electrometer, 602 Quadrature component, definition, 477 Quantity of electricity Ampere-Hour Meters, 71, 651 definition, 11, 127 Quarter-phase, definition, 479 Quarter-phase system, definition, 382 distribution, 382 Quartz tube mercury arc lamps, 586 Radiation electromagnetic, 771 of heat, 30, 319 logarithmic decrement by, 494, 783 specific luminous, definition, 491 sustained, definition, 495 (see also Heat and Thermal Properties and Waves , Electromagnetic ) Radio, Standardization Rules of A. /. E. E., 492 Radio telegraphy, see Wireless Telegraphy Ratio colls, of Wheatstone bridge, 624 Reactance armature, 254, 414 definition, 359 drop, per cent, definition, 479 inductive, see Inductance and Inductive Reactance leakage, calculation, see name of apparatus power limiting, see Reactance Coils and susceptance, relation of, in A. C. circuits, 377 transformer, 414 voltage. Generators, Direct- Current, 254 Reactance Colls or Reactors, 503. 776 Reactance Coils or Reactors — Cont'd applications, 406, 760, 776, 799 definition, 503 iron core reactance coils, 799 power limiting reactance or protective colls, 406 short-circuit, K. V. A., calcula- tion, 406 Reaction, reactions armature, see Armature reac- tion, 255 Reactive, component, definition, 477 factor, definition, 478 volt-ampere, definition, 478 Reactor, reactance, see Reactance Coils Receivers, telephone, 739 radio, 791, 805 Recording instruments, defini- tion, 482 Rectifiers crystal, 787 electrolytic, 786 mechanical, 431 mercury arc, 430 applications, 430 connections, 430 efficiency, 430 operation, 430 regulation, 430 Refiectors for incandescent lamps, 557 Refraction, electro-magnetic waves, 767 Regulation arc lamps, 564, 572 Distribution Systems, 313 speed, of industrial motors, 345, 448, 483, 521 Standardization Rules o/ A. I. E, E., 482 voltage, see Regulators and name of apparatus Regulators field, 336, 339 Tirrill, alternating-current, 406 (see also Relays) Reluctance, magnetic, definition, 143 Regonerative braking, 351, 608 86« Index Kclaya definition, 496, 756 telephone, definition, 756 (see also Regulators) Remanent magnetism, definition, 168 Repeaters, telegraph, 759 telephone, 759 Repeating coil, definition, 759 telephone, 759 Residual magnetism, 167 Kegistance and conductance, Elec- tric, 33, 377 annealed copper standard, 29 boxes, see Resistors and Rheo- stats calculation of resistance, 28, 34 conductivity, definition, 34 critical, definition, 494 definition, 15, 23 equivalent, definition, 416 insulation, measurement of, 509, 684 insulation resistance of ma- chines, limits, 509, 686 Internal, of primary battery, 45, 681 internal, of storage battery, 67, 681, 700 internal, test for, 422, 508, 697 relations in A. 0. circuits, 358, 364, 369 resistance drop, definition, 479 resistance drop, per cent, 479 resistivity, definition, 27 measurements, 624, 669, 671, 677, 679 of metals, 29 of solutions, 31, 67, 701 units, 29 Skin Effect, 496 specific electric, see Resis- tivity, 27 temperature coefficient definition, 31, 539 measurement, 624, 669, 671, 677, 679 of metals, 509 of solutions, 67 Resistivity definition, 34 measurement, 624, 669, 671. 677, 679 of insulators, see name of ma- terial Resistivity— Cont'd of metals, table, 29 of solutions, table, 31, 67 units, 29 values, see name of material Resistor, definition, 481 Resistors, Standard, and Resist- ance Boxes arrangement of coils, 626, 627 boxes, 627 mercury resistance, 23 (see also Rheostats and Resist- ors) Resonance curve, definition, 495 definition, 380, 496 in series circuit, 380 Resonant circuit, 773 Retcntiveness, definition, 168 Rheostats and Resistors commercial types. Vol. II field rheostats, 336, 339 wire rheostats, 665 (see also Resistors, Standard-) Right-hand rule, 181, 182 Right-handed screw rule, 147 Ringers, telephone, 760 Root-mean-square value (R. M. S.), definition. 365, 476 Rotary converters, see Convert- ers, Synchronous Rotating field. Motors, Polyphase Induction, 445 Rotor of induction motor, defini- tion, 440 Rubber, 38 application to conductor, 38 compounds, 39 vulcanizing, 38 S Saturation curve, 306 full-load, definition, 409 no-load, definition, 306, 510 typical, 409, 512 (see also name of apparatus) factor, definition, 480 magnetic, definition, 166 percentage, 480 Scott connection, 424 Search-lights, see Arc lights Sechometer, 706 Index S51> Secondary batteries, see Batter- ies, Storage Sediment in lead batteries, 75 Selecting, definition, 495 Selenium, 836 Self-inductance, see Inductance and Inductive Reactance Self-induction, definition, 184 Separators for lead batteries, 64 Series circuit, calculation, 34 distribution system, 317 generators, 276, 512, 577 -parallel control of railway motors, 343 wound, see name of apparatus Short-circuit stresses, 406 Shunt wound, see name of appa- ratus Shunts ammeter, 119, 613 Ayrton and Mather, 709 construction, 708, 709 diverter, 518 series field, 306 universal, 709 Siemens, electrodynamometer , 604 Sine-wave currents and voltages, 360 Single-phase, definition, 478 S'nusoid, equation of, 358 Sirocco fans, Vol. II Six-phase, definition, 479 Skin Effect, 496 definition, 496 Slip of induction motor, 443 measurement, 465 Slot pitch, definition, 408 Slots, see name of apparatus Solder, 65 Solenoid, solenoids inductance of, 189 magnetizing force d"e to, 151 simple, calculation of pull, 160 standard, for calibrating ballis- tic galvanometer, 717 (see also Electromagnets) Spark coils, see Induction Coils electric gap, effect of free oscillations, 775, 781, 816 quenched, effect of, 797, 816 Spark Gap for Measuring High Voltages, 421 Standardization Rules of A. I. E. E. Sparking, 253, 507, 724 Specific consumption, definition, 492 Specific inductive capacity, see Dielectric constant SpeciQc resistance, see Resistivity Speed classification of motors, A. T. E. E. standard, 500 control, see Control and Con- trollers control of D. C. motors, 243, 352 (see also name of apparatus) Split-pole converter, 434 Standard cells, see Cells, Stand- ard Standardization Rules of the A. I. £. £., 475 abbreviations, xi capacitance, 481 classification of machinery, 496 instruments, 482 rotating machines, 497 stationary induction appa- ratus, 502 definitions, 475 efficiency, 482 heating, 538 illumination, 488 photometry, 488 radio, 493 regulation, 408, 416, 482 switching equipment, 487 symbols, xi temperature, 538 limits, 538 meas'^rements, 538 operating, 538 transformer connections, 417 wires and cables, specifica- tions, 484 wires and cables, stranding, 485 wires and cables, terminology, 486 Star connection, 385 Starters, Kotor, 795 automatic, 796 contactor starters, Vol. II for D. C. motors, 340 for induction motors, 451 starting box, 340 8«0 Index Starters, Motor — Cont'd starting compensator, 451 for synchronous motors, 438 (see also Controllers and Rheo- stats) Starting, see name of apparatus Starting box, for D. C. motors, 340 see also Starters, Motor Stator of induction motor, defi- nition, 440 Steel conductivity, electric, 29 Magnetic Properties, 167. 300, 480, 715 resistivity, electric, 29 temperature coefficient of elec- tric resistance, 31 Storage batteries, see Batteries, Storage Stranding, flexible, A. I. E. E. standard, 485 Stray fields, effect on meters, 170 Stray load losses, definition, 244 Stray-power loss Generators, Direct-Current, 244 test of motors, 524 Susceptance, definition, 377 and reactance, relations in A. C. circuit, 377 Susceptibility, definition, 377 Swinburne's test, 624 Switchboards D. C. switchboards, typical, 328 Shunts, 610 telephone, 754 Switches disconnecting, radio, 819 end-cell, 66 hook, telephone, 750, 753 knife. Vol. II plug, 753 Symbols, AJ)hreviations and Sym- bols, XI A. I. E. E. standards, xi photometric, 488 Synchronizers and Synchroscopes, 482 lamps, 438 Generators, Alternating-Cur- rent, 400 Synchronoscope, see Synchro- nizers, 482 Synchronous converters, see Converters, Synchronous frequency changers, 429 machines, A. I. E. E. claBsifica- tion, 499 motors, see Motors, Synchro- nous Synchroscope, see Synchronizers T-connection of transformers, 424 Tachometers, 639 Tanks for lead batteries, 65 Tantalum lamps, 548 Telegraph keys, 802 radio, see Wireless Telegraphy Telephone Instruments and Circuits, 753 batteries, 756 bells, 749 central office equipment, 754, 757 impedance coil, 760. 761 induction coil, 747 intercommunicating system, 760 party line circuits, 760 private exchanges, 760 receivers, 496, 745 arc as, 836 repeaters, 756 repeating coil, 759 ringers, 749, 760 switchboards, 754 telephone sets, 762 transmitters, 740 arc as, 836 navy standard type, 744 radio-telephony, see Wireless Telephony Temperature elevations, A. I. E. E. standard, 538 limits, A. I. E. E. standards, 538 measurement by resistance, 538 by thermometer, 538 by thermometer, surface, S38 Indkx <st;i Temperature — Cont'd measurementa, A. I. E. E. standards, 538 rise, see Heating under name of apparatus; also Stand- ardization Rules of A. I. E. E. Temperature coefficient of electromotive force, 91 of resistance, see name of ma- terial, 31 of resistivity, 31 definition, 31 of insulators, see name or material of metals, 31, 539 of solutions, 31, 67 (see Conductivity, tempera- ture coefficient of, and Re- sistance, temperature co- efficient) Testing, see name of apparatus, instrument or structure Thermo couples Sangamo meter, 651 Thermometers, see Temperature Thomson, ammeter, 615 Three-phase, 479 circuit, calculation, 389 definition, 479 system, definition, 383 system, distribution, 384 transformers, see Transform- era Time, standard of, 2 Time constant of a coil, 186 Tirrill regulator, 406 Toroid, magnetizing force due to, 161 Torque definition, 234 stalling, of motor, 449, 520 Traniformers air-blast, 416 air required for air-blast, 416 Aulo-Tranaformers and Com- pensators, 412, 503 blowers for, 416 classification, 412 connections, 417 constant current, 425 cooling, 416, 426 copper loss, 415 core, 426 Transformers — Cont'd core loss, 415 core type, 413 definition of terms, 413 delta connections, 419 designs, 413 dielectric tests, 420 eddy current loss, 416 efficiency, 415 exciting current, 412 heat run, 424 heating, 416 hysteresis loss, 416 impedance short-circuit, 416 installation, 425 insulation tests, 420 magnetic circuit, 413 magnetizing current, 413 marking of leads, 417' no-load loss, 421 oil-cooled, 416 operation, 412 parallel operation, 418 principles, 191, 412 radio, 796 rating, 424, 502 ratio, definition, 424, 503 reactance, leakage, 414 regulation, 416, 483 resistance, 422 Scott connection, 424 shell type, 413 stray load loss, 421 T-connections, 424 tests, 420 theory, 412 three-phase, 423, 428 vector diagram, 413 water-cooled, 416 windings, 426 for wireless stations, 796 Y-connect'ons, 423 Transformers, Instrument, 503 current transformer, 503 definition, 503 potential transformers, 503 ratio, definition, 503 Transient Electric Phenomena and Oscillations coil alone, 185 damping, 185, 492,. 783 time constant, 186 Transmitter, telephone, defini- tion, 740 Transmitting set, radio, rating, 793 Hiy'i Index Trimming of arc lamps, 563 Tudor battery plates, 62 Tungsten lamps, 547 Tuning, defin'tion, 495 Turbo-generator, ii, 288, 329, 402 Unit Abl>reviation8 and SymbolSy xr absolute units, 10-16 acceleration, angular and lin- ear, 2 area, 2 capacity, 21, 24, 129 C. G. S. 867 Virtual value, definition, 365 Volt box, 667 Volt, international, definition, 24 Volt-amperes, definition, 478 Voltage alternating, see Alternating- Current control in distribution system, 316 definition, 12 for distribution, used in U. S.. 191 induced, deflnHlon, 175 rating of incandescent lampi>. 557 terminal, definition, 240 Voltmeters calibration, 390, 665, 668 care of, 661 definition, 482 electrostatic, 390, 602 series resistance, 612 types, 390 uses, 656 W Ward Leonard control system. 348 Water for water-cooled trans formers, 416 Index 868 Watt, deflnition, 9, 24 Watthour Keten, 482 commutator tsrpe, 652 accuracy, 654 adjustment, 654 mercury motor t3rpe, 648 accuracy, 649 adj stment, 649 pi^inciple of operation, 649 testing, 650 Wattless component, definition, 377 Wattmeters connection to load, 389 definition, 482 principle of operation, 391 radio, 803 three-phase power, measured by two-wattmeter method, 389 types, 391 Wave, Waves electric, see Electromagnetic Electromagnetic, 493, 766, 839 application, 766 deflnifon, 777 Detectors, Electric Wave, 786 energy, 778 equations, 777 Hertz oscillator, 767 propagation, 766 theory, 766 velocity, 777 Wave form, definition, 407, 476 deviation, 407 standards, 407 Wave length, definition, 777 constant, definition, 777 meter, see Wavemeter, 826 relation for wireless teleg- raphy, 777 Wavemeter, 826 capacity, measured by, 708 definition, 495 Weight, definition, 5 Wheatstone bridge, 106, 635 condenser tests, 703 galvanometer, best location, 676 precaution and care, 675 prec'sion, 675 Windage loss, see name of appa- ratus Windings armature, 217, 297, 697 Generators, AUernating-Cur- rent, 401-405 Generators, Direct-Current, 217 drum, 217 electromagnet, see Electromag- net Winding field, Generators, Alternating- Current, 402 Generators, Direct-Current, 259, 275 lap, 223 wave, 226 (see also name of aiJparatus) Wireless Telegraphy antenna, 493, 779 apparatus, 793 charging transformer, 775 condensers for transmitting station, 798, 813, 814 coupled circuits, 781 electromagnetic waves, 766 free oscillations, 765 period, 765 power required, 793, 821 protection, 799, 819 quench spark, 797, 816 radiation, logarithmic decre- ment, 494, 782 receiving circuits, 785, 805 spark gap effect, 775, 781, 816 transmitting circuits, 775 wave lengths, 777 Wavemeter, 826 Wireless Telephony, 835 connections, 841, 838 high-frequency generators, 790 theory, 835 Wires and Cables, Bare conductivity, electric, 29 copper, 29 conductivity, electric, 29 stranded concentric lay, B. & S. a, 486 resistance, see Wires, Resist- ance size, calculation, 29 steel conductivity, electric, 29 864 Index Wires and Cables, Bare— Cont'd stranded concentric lay, 485 component wires, 485 stranding, 485 stranding, A. I. E. E. standards, 485 table of resistance, 29 Wires and Cables, Insulated capacity, electrostatic, and charging current, 487, 691, 713 measurement, 691, 718 insulation resistance, 487, 69.1, 713 Wires and Cables, Insulated — Cont'd insulation, various materials. 37 Ruhher, 38 stranding, A. I. E. E. stand- ards, 485 Wires, Besistanoe property tables, 29 Y-counections, 385 Transformers, 423 14 DAY USE RBTUBN TO DESK FROM WHICH BORROWBD LOAN DEPT. This book is due on the last date stamped below, or oa the date to which renewed. Renewed books are sabject to immediate recalL m mtr pPTc^n t DCClPmfl AUG 2 3 1973 o-^^W LD 21A-50m-4,'60 (A95628l0)476B Gcneial Libr«rT UniTenity of CalifirtiU YC 66363 i. 