INDEX. 



515 



Magnetic properties of iron and steel, 

 table, 365 



reluctance, 368 

 Magnetism of iron, 351 



residual, 361 

 Magnetization curve of a dynamo, 384 



curves, 362 



intensity of, 359 



of iron, 12 



Magnetizing force in iron, 356 

 Magnetomotive force of a coil, 354 

 definition of, 352 

 units of, 356 

 Magnet, the, I 



pole, sign of, 3 



windings, bunched and distributed, 



351 

 Magnets, mutual action of, I 



permanent, 361 



Matthews photometer, the, 318 

 Maximum demand meter, the, 235 

 Mechanical efficiency of a motor, 141 

 Mercury-vapor lamp, 350 

 Meter, the maximum demand, 235 



the two-rate, 235 

 Mil, definition of the, 451 

 Motor and generator efficiencies, 127 



losses, 127 



direction of running of, 95 

 efficiency, calculation of, 138 



Siemens' law of, 99 

 fundamental equation of, 97 

 shunt, starting of, 1 12 

 the, 35 



the compound, 1 1 6 

 the "multi speed," 106 

 the series, 118 

 the shunt, 101 



speed control of, 105 



regulation of, 104 

 torque, 98 

 Motor generator balancer, the, 274 



the, 70 

 Motors and generators, characteristic 



curves of, 123, 408-417 

 diseases of, 175 

 field excitation of, 48 



Motors and generators, management of, 



172 



starting of, 174 

 speed control of, comparison of 



methods, 109 



Multiplex armature winding, 429 

 Multipolar versus bipolar dynamos, 65 

 Multivoltage speed control of motors, 108 



National Electrical Code, the, 220 

 Nernst lamp, the, 349 

 Network of conductors, solution of, 27 

 Neutral axis of armature, 93 



Oersted, the, 369 

 Ohm, definition of the, 20 

 Ohm's law, 23 

 Open-arc lamp, the, 336 

 Operation test of a station, 199 

 Osmium lamp, the, 267, 348 

 Output of a generator, 8 1 

 Over-compounding of a generator, 86 



Parallel connections, 24 



grouping of glow lamps on arc cir- 

 cuits, 267 



operation of generators, 184 



system of distribution, 266 

 Performance test of a station, 1 99 

 Permanent magnets, 361 

 Permeability magnetic, 365 

 Photometer, the Bunsen, 313 



the integrating, 318 



the Matthews, 318 

 Photometry, 308, 309 



simple, 309 

 Pole-line construction (reference), 305 



lines, insulation of, 304 



mechanical stresses in, 276 



magnet, sign of, 3 



strength of a, 2 

 Poles, distributed and concentrated, 2 



of a magnet, I 

 Power, electrical, systems of selling, 232 



cost of, 221, 223 



rating of generators, 82 



Radiant heat, definition of, 308 



