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alloy American ammeter amperes apparatus arc lamps arc lighting armature battery became began Belden Brush build bulb burn carbon cell chemical Clark cell coil commercial competitors conductor copper court device dynamo early Edison Edward Weston efficiency Electric Lighting Company electric power electrical engineering electrical instruments electrical measurements electrodes electroplating Elihu Thomson experiments Faraday field filament firm Franklin Institute friends galvanometer gave glass heat important improvement incandescent lamp industry infringement installed interest invention inventor knew laboratory later machine magnetic circuit manufacture mechanical ment metal method motor never Newark nickel nickel plating night operated patent Perkin Medal permanent magnet pioneer plant poles practical problem produced Professor pump resistance scientific scientist shaft shunt solution soon standard steel Street successful suit Tamidine temperature thing Thomson tion took turned United States Company voltage voltmeter Weston dynamo wire York young