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age of electricity alternating current American application arc light armature Atlantic cable battery Bell Bell's British broadcasting carbon Cataract company century coil commercial communication conductor construction detector device direct current discovery dynamo Edison Edison effect efficiency elec electric current electric light electric motor electric power Electrical Engineers electromagnetic induction electromagnetic waves electronic energy erator experiments Faraday Faraday's Fessenden Fleming frequency Hertz Hopkinson Ibid idea improved incandescent increased induction industry invention inventors iron lamp lines of force machine magnetic circuit magnetic field manufacturing Marconi company mathematical Maxwell means mechanical ment messages method miles monopoly Morse Niagara Falls operation pany paper patent physicists principle problem produced radio receiver result rotating scientific signals Sprague stations street railway success tele Telegraph Company Telephone Company Thomson tion transmission transmitted tricity triode United vacuum tube vibration voltage Western Union Westinghouse wire wireless wrote York