Thomas Alva Edison 1847 - 1931. The Harmsworth Encyclopaedia 1930S / 1940S - Thomas Alva Edison Was An American Inventor And Businessman Who Has Been Described As America`s Greatest Inventor. He Developed Many Devices In Fields Such As Electric Power Generation, Mass Communication, Sound Recording, And Motion Pictures. Edison Is Credited For Contributing To Various Inventions, Including The Phonograph, The Kinetoscope, The Dictaphone, The Electric Lamp In Particular The Incandescent Light Bulb, And The Autographic Printer. He Also Greatly Improved The Telephone By Inventing The Carbon Microphone.

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