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Dynamos and Motors
Electrons and X Rays
Telegraphy and Telephony
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Alexander Graham Bell alternating current alternating-current American ammonia armature atoms automobile battery became Bell brake cable carbon Carnegie cars cathode cent charge circuit coil Company condenser conductor copper cords Corliss cylinder device diagram direct current direct-current dynamo E. H. Harriman Edison electric current electromagnetic electrons experiments Faraday field Figure filament film force frequency furnace galvanometer Guglielmo Marconi Harriman heat heddles Henry improved induction invention inventor iron Jacquard lamps Langley leashes light loom magnetic manufacture Marconi mechanical metal miles motor National Museum needle negative operation optical glass oscillations paper patent Pelton wheel piston Plate pole pounds pressure printing produced radio railroad rays reactance reciprocating engines rubber sewing machine shown shows Smithsonian speed steam engine steam turbine steel telegraph telephone temperature Thomson thread tion tube tungsten turbine United vacuum vacuum tube valve vibration voltage warp water turbine waves weaving Westinghouse wheel wire wireless