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alternating current aluminium ammeter ampere-hours amperes apparatus armature arranged Ayrton battery brushes busbars cable carrying cell cent circuit breaker clamp commutator conductor connected consists constructed copper copper wire current passes deflection designed direct current disc drum dynamo eddy current Edison electric power Electrical Engineers electro-magnet electrolytic employed example shown exhibited Ferranti field magnets Flashover frequency fuse Gramme grid induction motor instrument insulated introduced iron core Lent by Messrs load magnetic field magnetising MAGNETO-ELECTRIC MACHINE mechanical mercury metal meter Metropolitan-Vickers mounted moving coil needle ohmmeter operation overhead line patented permanent magnet phase pointer pole pieces porcelain power factor Presented pressure principle rectifier relay resistance ring rotating rotor shaft shunt Siemens soft iron speed spindle spring station steel suitable supply switch terminals three-phase torque transformer transmission tube units vertical voltage voltmeter volts wattmeter windings wound