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amount amperes apparatus application armature arrester atoms autotransformer blades capacitor capacity cent circuit breakers coil connected cooling copper core cost curve cycle developed device dielectric heating direct current drive dynamometer electrical electrons energy engineering equipment fault current feeder ﬁeld ﬁlm ﬁrst ﬁve ﬂow ﬂuorescent footcandles frequency furnace gas turbine ground heat high-speed high-voltage Hipersil horsepower ignitron inch increase induction induction heating industrial installation insulation laboratory lamp light lightning arresters limit load loop machine magnesium magnetic material maximum metal motor obtained operation output phase plant power factor pressure problem production protection radiation reactance reactor rectiﬁer reduced relay resistance resistor rheostat Rototrol secondary short-circuit shown in Fig speed station steam steel supply surface switch tank temperature thyratron tion torque transformer tube turbine unit voltage volts welder welding Westinghouse winding wire