210 



INDEX. 



Equivalent sine curves, 53 



phase-difference, 53 



Evershed, 63 



Fall of potential along reactive circuits, 



49 



Farad, definition of the, 10 

 Faraday's law of induced E.M.F.s, 12 

 Feldman, 63 



Ferranti transformers, tests of, 61 

 Field magnets, 17 



of force, 1 



Fleming, Dr., 8 



Fourier series, 50 



Frequency, 19 



Fuller-Wenstrom induction motors, 113 



Fundamental term, 50 



G 



Generators, 16 

 Graphical methods, 30, 31 



H 



Harmonics, 50 



Heating of rotary converters, 122 



Heyland induction motors, 113 



Higher harmonics, 50 



, R.M.S. values of curves con- 

 taining, 52 



Hot-wire voltmeters, 26 



Hysteresis loss, 59 



, calculation of, 77 



per cub. cm. at different in- 

 ductions, 62 



Hysteretic constants for different mate- 

 rials, 62 



energy current, 59 



Idle currents, 59 

 Impedance, 21 



coils, 56 



Induced currents, 13 



EM.F.s, 12 



Inductance, 6 

 Induction, 3 



motors, 98 



, devices for starting, 110 



, monophase, 109 



, structure of, 112 



, torque of, 108 



, theory of, 107 



Inductor alternators, 17 

 Insulation tests of transformers, 79 



Kelvin balances, 26 



Lag, definition of, 39 



Lamination of transformer cores, 59 



Law of force, 2 



Lead, definition of, 39 



Line of force, 1 



M 



Magnetic field due to an electric 

 current, 4 



force, 1 



leakage in transformers, effects of, 



70 



Magnetizing force, 5 



Measurement of power, 29, 129 



of power in tri-phase circuits, 135 



Methods of testing efficiencies of trans- 

 formers, 72 



Microfarad, definition of, 10 



Monophase induction motors, 109 



transformers, 59 



Motor-generators, 118 



Motors, di-phase, 103 



, induction, 98 



, tri-phase, 104 



Mutual induction, 7 



in parallel circuits, 47, 48 







Ohm's law, 21 



Parallel circuits, 47 



, mutual induction in, 47, 48 



Performances of induction motors, 113 

 Periodic time, 19 

 Permeability, 5 



of annealed wrought iron, 5 



of grey cast iron, 5 



Phase, definition of, 21 

 , difference of, 21 



transformers, 117 



Phase-difference, equivalent, 5:5 

 Pole strength, 1 

 Polyphase currents, 94 



transformers, 116 



Potential, 9 



difference, 19 



Power, apparent, 28 

 factor, 28 



