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Image: Marconi Valve Tuner

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Marconi_Valve_Tuner.jpg ‎(529 × 367 pixels, file size: 42 KB, MIME type: image/jpeg)

Description: The Marconi Valve Tuner, an early unamplified radio receiver manufactured by the Marconi Company for use on ships to receive wireless telegraphy signals. It used the Fleming valve, the first vacuum tube, invented by John Ambrose Fleming as a detector to rectify the radio wave carrier and extract the Morse code "dots" and "dashes", The set had two valves (visible at top); one was a spare in case the other burned out.
Title: Marconi Valve Tuner
Credit: Retrieved December 30, 2015 from Rupert Stanley (1914) Textbook on Wireless Telegraphy, Longmans Green and Co., New York, p. 252, fig. 144 on Google Books
Author: Rupert Stanley
Usage Terms: Public domain
License: Public domain
Attribution Required?: No

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