INDEX 



517 



Illumination, interior, 444 



law of inverse squares as applied 

 to, 417 



measurement of, 435 



semi-indirect, 447 



unit of, 415 

 Impedance, definition of, 33 



drop in alternator armature, 137 



equivalent value for a trans- 

 former, 187 



in alternating, current circuits, 

 33 



synchronous, 147 

 Inr:tndescence, 420 

 Incandescent lamps, 420 



carbon filament, 420 



effect of voltage variations 

 on, 424 



gas-filled, Mazda Type C, 423 



nitrogen filled, 423 



tantalum filament, 421 



tungsten filament, 421 

 Inclined-coil instruments, 54 

 Indicating electro-dynamometer, 52 

 Indirect lighting, 446 



Induced electromotive force, in later- 



nator, 120 



induction motor rotor, 236 

 transformer, 173 



Inductance, in alternating-current 



uits, 26, 32, 36, 40 

 Induction. Hem-rater, 265 

 operation, 266 

 used for regenerative braking, 



960 

 motor, 225 



ip of, 258 



circle diagram for, 270 

 cuncatrnatK.n of, 262 

 effect of rotor resist a i 

 Up 



induced dec' 



in rotor, 236 



polyphase machine used as 

 ,'hase machine, 296 



principle ti". 225 



Induction, motor, reversing direc- 

 tion of rotation of, 234 

 rotating field of, 227 



drum-wound machine, 231 

 method of reversing d. 



t. on of, 234 

 three-phase Gramme-run: 



winding. 230 

 two-phase Gramme-ring 



winding. 228 

 rotor frequency of, 236 

 single-phase (see Single-phase 



motors), 292 

 slip, definition of, 226 



measurement of. 273 

 speed control, 258 



change of number of poles, 



Ml 



change of slip, 259 

 concatenation, 262 

 frequency change, 261 

 rhius method. 259 

 squirrel-' _' 11 



applications, 248 

 break-down torque, 245 

 effect of reactance on, 247 



n, 247 

 disadvantages of, . 



t of load on p<> 

 >r of, 244 



operating cl. 



starting of. 249 

 starting torque of, 246 



of slip oi 



ct of voltage on, 246 

 synchronous speed of, 235 

 torqi; 



u.-ed M pii.-isi- MMtrerter, ::<M 



WOUnd-rotor type, 253 

 1 



' li xjuirn I- 

 cftfe, 256 

 disadvantages, 255 



