The 'Ignitron' tube, 1938. Invented by Joseph Slepian, an employee of Westinghouse, the Ignitron is a gas-filled tube known as a mercury-arc rectifier. It is used to switch high currents in heavy industrial processes. Churchman's cigarette card, from a series titled Modern Wonders [WA & AC Churchman, Great Britain & Ireland, 1938].
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