522 



INDEX 



Siemens dynamometer, 51 

 Siemens-Halske method of syn- 

 chronizing alternators, 170 

 Silhouette, seeing at night by means 



of, 448 



Simplified vector diagram for trans- 

 former, 182 

 Sine wave, 3 



construction, 4, 5 



equations for currents and 



voltages, 11 

 Sines, table of, 458 

 Single-phase, motors, 279 

 induction, 292 



direction of rotation, 294 

 fluxes in, 292 



polyphase motor used as, 296 

 reactions in, 294 

 starting, 296 

 repulsion, 300 

 shaded-pole method, 298 

 split-phase method, 296 

 auxiliary poles, 296 

 three-phase winding, 



298 



torque, 298 



used as phase converter. 300 

 Norfolk and Western 



Railway, 302 

 three-phase voltages ob- 

 tained from, 301 

 two-phase, 300 

 Wagner Type BA, 300 

 repulsion (see Repulsion 



motor), 286 



repulsion-induction (RI), 303 

 speed characteristic, 303 

 starting torque, 303 

 series (see Series motor), 279 

 unity power-factor, 304 

 Single-phase transmission line, 378 

 calculations for, 387 

 capacitance of, 383 

 charging current of, 383 



table of, 466 



for railway electrification, 

 378 



Single-phase transmission line, re- 

 actance of, 380 

 table of, 465 

 vector diagram for, 388 

 with considerable capaci- 

 tance, 391 

 Single-phase winding of alternator, 



101 



Single- range winding, 104 

 Slip, definition of, 235 



effect of rotor resistance on, 253 

 measurement of, 273, 275 

 squirrel-cage motor, 243 

 synchronous speed, 235 

 Solid angle, 414 

 Specular reflection, 449 

 Speed control f induction motor, 



258 

 change of number of poles, 261 



of slip, 259 

 concatenation, 262 

 frequency change, 261 

 Scherbius method, 259 

 Speed of synchronous motor, 306 

 Spherical, ca.ndlepower, 415 

 reduction factor, 441 

 Spiral winding, 101 

 Split-pole converter, 361 

 commutation of, 362 

 Squirrel-cage induction motor (see 



Induction motor), 241 

 Starting, compensators, 250 



induction motors, 249, 255 

 single-phase induction mo- 

 tors, 296 

 synchronous, converters, 368, 



372 



motors, 320 

 torque of squirrel-cage motor, 



245 



Stator construction of alternator, 111 

 Steradian, 414 

 Street illumination, 442 

 Stroboscope, 273 



Structures for transmission lines, 403 



Sub-stations (see Transmission line, 



substations), 406 



