INDEX 283 



PAOB 



Virtual displacements, principle of 249 



Voltage. See E.in.f. 



Wave form of e.m.f., effect of type of windings upon 73 



how to get sine wave 72 



Wave-wound armatures, commutation of 237 



\\ VI MT, definition of G 



\\ ire. iron, for cores 41 



Winding-pitch factor, values of 71 



Windings, compensating, for D.C. machines, 171 



concentrated, m.m.f. of 121 



for D.C. machines, effect of type on voltage 76 



distributed, definition of 121 



in A.C. machines, advantages and disadvantages 



of 66 



formula for the inductance of 219 



fractional pitch, advantages and disadvantages of 67 



commutation of 238 



effect of, on induced e.m.f 67, 76 



on inductance 225, 231 



inductance and reactance, how measured 219 



leakage permeance of, formula for 220 



multiplex, commutation of 238 



pole-face for D.C. machines 174 



polyphase, m.m.f. of 128 



wave or two-circuit, commutation of 237 



Yrneh, definition of 10 



Zig-zag leakage, description of 223 



permeance, calculation of 227 



