288 



INDEX 



Compounded alternator, Heyland, 266 ; 



Latour, 265 ; Walker, 98 

 Concatenation of induction motors, 226 

 Condenser, 11 ; condenser action of syn- 

 chronous motor, 13 1 

 Connections of polyphase systems, 33 

 Constant, potential transformer, 101 

 Converters, 81, 236; heating of, 241, 2*6 ; 

 hunting of, 254 ; output of, 249 ; starting 

 of, 257; voltage regulation of, 255; v. 

 motor-generators, 258 

 Copper losses in transformers, 109 

 Core, ageing of transformer, 171 ; best 

 dimensions of transformer, 109 ; losses 

 in transformer, 106, 169 ; losses, separa- 

 tion of, in transformer, 169 ; plates, 

 thickness of, in alternators, 83 ; in trans- 

 formers, 106 



Damping coils, 137, 254 



De Lignieres, starting of induction 

 motors, 217 



Delta coupling of three-phase circuits, 35 



Ue'ri, starting of induction motors, 217 



Dielectric strength test, 164 



Differential action, 81 



Dispersion coefficient of induction motor, 

 182 



Double-current generators, 78 



Drop of voltage in alternators and trans- 

 formers, 151 



Drysdale, C. V., slip indicator, 210 ; watt- 

 meter, 71 



Duddell, oscillograph, 77 



E 



Eccentricity, effect of rotor, 126 



Economy coils, 112 



Eddy-current brakes, 206; eddy-current 

 loss in transformer cores, 107; effect of 

 eddy-currents on wattmeter reading, 49 



Edge-strip winding for field coils, 86 



Efficiency of induction motors, 125, 197 ; 

 of transformers, 109, 167; test of alter- 

 nator, 172 ; test of induction motor, 212, 

 215 



Electromagnetic repulsion, 25 ; motor, 25 



Electrostatic voltmeters, 63 



E.m.f. of alternator, 92; of transformer, 106 



Energy, measurement of, 58 



Everett-Edgcumbe rotary synchroniser, 

 142 



Fischer-Hinnen, analysis of armature 

 reactance, 161 



Fleming, electromagnetic repulsion ex- 

 periments, 25 



F..rm factor, 2, 7 



Frequency of alternating current, 2 ; 

 frequency transformer, 227 



Friction loss in induction motors, 199, 

 211,212 



Fynn motor, 286 



G 



Gap induction in alternators, 93 

 Generator action of induction motor, 219 

 Goldschmidt, alternator testing, 17<i 

 Gorges, commutator motor, 259 

 Graph of alternating current, 1 

 Grau, voltmeter, 67 ; eddy-current brake. 

 206 



II 



Hawkins, e.m.f. of alternator, 95 

 Heating of converter, 241, 246 ; heating 



test of alternator, 175; of induction 



motor, 217 ; of transformer, 170 

 Helios Co., induction motors with large 



starting torque, 217 

 Henri-tropic winding, 88 ; asymmetry of, 



with odd number of pole-pairs, 124 

 Heyland, alternator, 206; circle diagram, 



194 ; compensated induction motor, 259 ; 



leakage coefficients of induction motor, 



182 



High voltage instruments, 67 

 Hobart, dispersion coefficient of induction 



motor, 182 ; Hobart and Punga, heat 



test of alternator, 177 

 Hopkinson leakage coefficients, 182 

 Hot-wire instruments, 61 

 Hunting, of alternators, 150 ; of rotary 



converters, 254 ; of synchronous motors. 



135 



I 



Idle component of current, 16 



Impedance, 12 ; impedances in series, 17 ; 

 in parallel, 19 ; impedances of alter- 

 nators and transformers, 152, 165; 

 impedance coils, 114 



Impressed e.m.f., 7 



Induced e.m.f., 7 



Inductance, 8 



Induction, gap, in alternators, 93 ; in 

 transformer cores, 106; induction regu- 

 lator, 255 ; induction generator, 219, 

 224; induction motors, 115; com- 

 pensated, 259; speed control of, 225; 

 testing of, 198 ; theory of, 180 



Insulation of alternator armatures, 91 



Inverted rotaries, 236 ; racing of, 257 



