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Thomas Edison (1847-1931). Century engraving of the US inventor Thomas Alva Edison with his phonograph. Edison is famous for inventing or improving devices such as the phonograph and the electric light bulb. He founded several laboratories and companies, and filed over 1000 patents. Other work included improvements to telegraphy, cameras, and motion picture cameras, as well as his DC (direct current) electrical distribution systems. In 1880, Edison founded the journal 'Science'. He also discovered the Edison Effect, on which thermionic valves are based. From Weltall und Menscheit (Universe and Humanity), by Hans Kraemer (ca.
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