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325 PAGE "Neutral point, line or zone, commutating machines 178 Nomenclature of electrical apparatus. 121 Nominal induced E.M.F. of synchronous machine 128 Nonpolar induction 11 machine 125 "N-phase converter. 226, 233, 235, 236 direct current converter. 252, 259 Ohm 9 Ohms law 103 Open circuit winding 168 coil arc machines 124 ■Oscillating armature reaction of con- verter , ; 240 ■Over -compounding of coQverter. 244 curve of commutating machine. 192 of transmission lines 98 ■Over-synchronous rotation of induction machine .... 298 Parallel connection 107 Parallelogram of sine waves 44 Parallel operation of alternators. 154 operation of alternators, division of load 156 operation of alternators, fluctuating cross-currents .... 157 Permeability. ... 4 Phase .... 13 of alternating wave. 43 angles G5 characteristics of synchronous motor, J46 control of transmission lines. 94 converters 12 J, 124 converter, induction ... 309 displacement, affecting converter ratio 226 displacement in converter, affecting rating 235 displacement in inverted converter. 247 splitting devices, starting single- phase induction motor 291 Polar coordinates .41 Polarization cell ... 125 Pole face, eddy currents .... 185 energy loss ... 186 pulsation of flux. ... 185 Pole, magnetic .... 1 Polygon of sine waves. 44 Polyphase induction machines. 124 induction motor 264 induction motor on single-phase cir- cuit 285 synchronous machines, unbalancing 151 Potential regulator ... .... 125 , PAGE Power efficiency 270 factor of admittance and of impe- dance, induction motor. 275 factor of induction generator. 301 factor of reactive coil 53 Primary admittance of transformer. 85 Pulsating armature reaction of converter 240 Pulsation of magnetism in pole face. 185 Quarter-phaser, armature reaction. 132 Quarter-phase converter, ratio 221, 226, 233, 235,236 direct current converter. 252, 259 Quadrature magnetic flux, single-phase induction motor .... 291 Racing of inverted converter. 247 Rating of converter, based on armature heating 228 of direct current converters. 259 of synchronous machines by arma- ture heating 236 Ratio of E.M.Fs. and of currents in converters ... 218 Reactance. ... 31 capacity. 57 effective 304 effective or apparent. 52 self -inductive. ... 52 synchronous. 129, 136 of transmission line ... .34 Reaction, armature, commutating ma- chines 187 armature, of converters. ... 236 armature, of synchronous machines 129 converters ... 243 magnetic .... ... 9 Reactive coil 53, 125 Real induced E. M. F. of synchronous machine. ,. ... 128 Rectangular components. G5, 79 Rectifying apparatus 122 machines 124 Reentrant armature winding. PAGE Resistance, effective 52, 104 effective, of eddy currents .... 53 effective , and hysteresis ... .48 E. M. F. consumed by . . . 32, 42 hysteretic . 52 inductance starting device of single- phase induction mptor .... 293 negative, of induction machine • . 308 speed curves of single-phase induc- tion motor 289' Resistivity 9 Resultant of rectangular components . 80 Ring winding 164 Rotary converter, see converter. Rotary transformer, see converter. Saturation affecting magnetic distribu- tion 181 coefficient, commutating machine . 189 coefiicient of synchronous machine . 148 curves, commutating machines, 188, 202 curve or magnetic characteristic of synchronous machine 147 of field, affecting synchronous ma- chines . 149 Self-inductance 19 Self-induction of alternating current cir- cuits . . . 29 of direct current circuits . . 22 for converter compounding . . . 243 counter E. M. F. of 31, 42 E. M. F. of : . . 9 E. M. F. consumed by . . 32, 42 and mutual induction IS of synchronous machines 133 of transmission line • . . . 17 Self-inductive reactance . . . 52 Separately excited machines, commutat- ing 1R2 Separately excited and magneto gener- ator, commutating . ... 205 Series armature winding . . 164, 166 connection ... 107 drum winding ... . . 166 generator, commutating . . .  . . . 206 machines, commutating . . 162 motors 123 motor, commutating . . 212 Sine waves, equivalent . . . 112 waves represented by circle ... 41 Single circuit single-phase converter 223, 226, 233, 235, 236 PAGfi. Single-phase converter, ratio . 220, 223, 226, 233, 235, 236 direct current converter . . . 252, 259 induction machines . ... 124 induction motor . . . 264, 281 induction motors, starting devices . 290 Single-phaser, armature reaction . . . 132 Six-phase converter . . 224, 226, 233, 235, 236 Slip and armature resistance, induction motor . 277 Slots, affecting magnetic flux . , 184 Smooth core armature .... 163 Sparking of converter ... ... 242 Sparkless commutation . . , 200- Speed characteristic, shunt generator , 209 curves, induction machine . . . 299- curves, induction motor concatena- tion . . ' 319' curves of polyphase induction motor 278 curves, series motor . . ... 214 curves, shunt motor . 212, 213 of inverted converter 247 and load curves, polyphase induction motor 272" and load curves of single-phase in- duction motor 286 regulation of alternators . ... 156 variation of engines driving alterna- tors 158 Spiral armature winding 169 Star connected three-phaser, E.M.F, . 16 Starting of converters 244 device and acceleration, single-phase induction motor 295 devices of single-phase induction mo- tors 290 of direct current 22 of polyphase induction motor . . 277 of synchronous motors 153 torque, polyphase induction motor . 280 Stopping of current 24 Strength of magnet pole ...... 2 Susceptance 105 Symbolic calculation of transformer . . 80 r<epresentation of sine waves ... 80 Synchronizing converters 245 Synchronous commutating machines . , 124 converters 124, 217 induction machine . ... . 307 madiines 122, 126 motor 123, 141 motor, characteristic curves . . 143 motor operated by induction genera- tor ... . . .303 motors, starting . .... 153 reactance .... . . 129, 136 watts .... , . 0(jgr INDEX. 327 PAGE Telephone line, mutual inductance . . 21 Tandem control of induction motors , . 315 Teeth of armature, saturation . . . 183 Terminal voltage of synchronous ma- chine ... . .128 Terrestrial magnetic field . . ... 5 Thermopile 125 Thonjson-Houston arc machine . . . 124 Three-phase armature winding .... 168 converter, ratio . .221, 226, 233, 235, 236 direct current converter . . 252, 259 machines . . 127 Three-phaser, armature reaction . . 132 E.M.F 16 Time constant of circuit .... 23, 34 Toothed armatures 163 Torque curves, series motor 214 efficiency ... 270 single-phase induction motor . . . 284 in synchronous watts 269 Transmission line capacity 57 charging current 57 compounding for constant voltage . 95 efficiency . 41 impedance . . , » . . . 58 load characteristic 89 magnetic fiux 6 overcompoundlng ...... g  general alternating current .... 312 rotary, see converter, wave shape of exciting current . . 114 Trigonometrical calculation of trans- former 72 Triphase, see three-phase. Twelve-phase converter . 226, 233, 235, 236 Two-circuit single-phase converter, 223, 226, 233, 235, 236 Types of commutating machines , . . 202 Unbalancing of polyphase synchronous machines 151 Uniphase, see single-phase. Unipolar induction ..... „ 11 machine 125 Unit capacity 55 current ... ... = . = , 2 E.M.F . . . c 9 of inductance . 20 magnetic field ........ 1 magnet pole ..,....,, 1 resistance 9 Variation of the ratio of E.M.F. 's of converter 225 Vector, polar representation of alternat- ing wave a . . 43 Vertical component of sine wave . . , 80  cross-currents of alternators . 156 current 40 currents and compounding of con- verter 242 E.M.F 39 Wave, alternating ... ... 30 shape, affecting converter ratio . . 226 shapes of converter armature cur- rents 229 shape of direct current converter ar- mature currents 255 shape of synchronous machines . . 127 winding of armature ... . . 170 Winding, armature 165 Zero vector, choice of . 45. 