ignitron


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ig·ni·tron

 (ĭg-nī′trŏn′, ĭg′nĭ-)
n.
A single-anode, mercury-vapor rectifier in which current passes as an arc between the anode and a mercury-pool cathode, used in power rectification.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

ignitron

(ɪɡˈnaɪtrɒn; ˈɪɡnɪˌtrɒn)
n
(Electronics) a mercury-arc rectifier controlled by a subsidiary electrode, the igniter, partially immersed in a mercury cathode. A current passed between igniter and cathode forms a hot spot sufficient to strike an arc between cathode and anode
[C20: from igniter + electron]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

ig•ni•tron

(ɪgˈnaɪ trɒn, ˈɪg nɪ trɒn)

n.
a rectifying vacuum tube with an auxiliary electrode projecting into a pool of mercury that conducts current when the anode is positive.
[1930–35; igni (te) + -tron]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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Important inventions included new lightning arresters, the Ignitron, de-ionizing circuit breakers, the ac-heated radio tube, the iconoscope, the Precipitron air cleaner, the tank gun stabilizer used by the Allies in World War II, the axial flow jet engine that powered America's first jet planes, and the x-ray imaging amplifier now universally used for medical fluoroscopy.
The Series M spot-welding controls are available with solid-state thyristor (SCR) contactor ratings of 63, 150, 300, 750, and 1200 amps, as well as almost any ignitron tube contactor.