512 



INDEX. 



Candle, the spherical-, 311 



the standard, 310 

 Candle-foot, the, definition of, 312 

 Candle-power of carbon-filament glow 



lamps, 344 



Carrying capacity, safe, of wires, 284 

 Cast iron, magnetic properties of, 365 

 Characteristic curves of a compound gen- 

 erator, 407 

 of dynamos, 383 

 of generators, 75 

 of motors, 408-417 

 of series generators, 386-397 

 of shunt generators, 397-407 

 of motors, 123 

 of the electric arc, 330 

 of railway motors, 415 

 Circuit breakers and fuses, 205 

 Circular mil, definition of, 451 

 Collecting rings, definition of, 37 

 Commutator bars, number of, 42 1 

 definition of, 39 

 details of, 63 

 Commutation, axis of, 93 

 the phenomena, 161 

 Compass, the, I 



Compensating field winding, 160 

 Compound generator, the, 47, 86 

 adjustment of, 90 

 connections of, 79 

 motor, the, 116 

 Constant-current distribution, 74 



transformer, the, 341 

 -voltage distribution, 74 

 Control of voltage of generators, 88 



of speed of motors, 109 

 Controller, the series -parallel, 121 

 Cooper-Hewitt lamp, see mercury vapor 



lamp. 

 Cost of electrical power, 223 



of steam power, 221 



Costs, installation and operation of sta- 

 tions, 220, 230 

 Coulomb's law, 3 

 Counter- electromotive- force cells, use of, 



2 5 6 

 definition of, 97 



Cumulative compound motor, the, 117 

 Current, electric, strength of, 15 



Density of wires, 283 



Dettmar's three- wire generator, 272 



Differential booster, the, 261 



compound motor, the, 116 

 DiflTusers, lamp, 338 

 Direct-current arc, 332 



dynamo, 38 

 Distribution and wiring, 266 



constant- current, 74 



constant-voltage, 74 



Edison three-wire system of, 268 



electric, size of wires for, 275 



parallel system of, 266 



series system of, 266 

 Dobrowolsky's three-wire generator, 273 

 Drum armature, the, 418 

 Dynamo, fundamental equation of, 43 



ratings, 169 



speeds, 145 



the, 35 



the alternating-current, 36 



the direct-current, 38 



the homopolar, 7 1 



the multipolar direct-current, 41 

 Dynamometer, use of motor as a, 143 

 Dynamos, diseases of, 1 75 



heating of, 148 



insulation of, 167 



management of, 172 



operation of, 172 



sparking of, 151 



sparking of, conditions of, 161 



special designs of, 69 

 Dynamotor, the, 70 



Eddy current loss in iron, 381 



currents, 49 

 Edison three-wire system of distribution, 



268 



Efficiencies of generators and motors, 127 

 Efficiency, all-day, of a dynamo, 469 

 of carbon-filament glow lamps, 344 

 of conversion of a generator, 135 

 of a motor, 141 



