Marconi radio valve

Marconi radio valve

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Credit: HUMANITIES & SOCIAL SCIENCES LIBRARY/NEW YORK PUBLIC LIBRARY/SCIENCE PHOTO LIBRARY

Caption: Marconi radio valve. This is a Marconi transmitter valve of the type M.T.6. Marconi patented his radio equipment in 1896, founding a company in 1897 to build the new equipment. The thermionic valve, or vacuum tube, first developed in 1906, is a device used to amplify or modify a voltage, in this case to transmit a radio signal. Photograph courtesy of the Radio Corporation of America, New York, USA, formed in 1920 from the American Marconi Company. Photographed for The March of Commerce (1927), volume 4 of The Pageant of America: A Pictorial History of the United States, a 15-volume series that commemorated 150 years since the founding of the USA in 1776.

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Keywords: 1900s, 20th century, american, apparatus, black-and-white, communication, communications, equipment, historical, history, history of science, m.t.6, marconi apparatus, marconi transmitter valve, monochrome, radio, technological, technology, telecommunications, telecommuniction, the march of commerce, the pageant of america, thermionic valve, transmitter, type mt6, us, vacuum tube, wireless

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