An ignitron is a type of gas-filled tube used as a controlled rectifier and dating from the 1930s. Invented by Joseph Slepian while employed by Westinghouse, Westinghouse was the original manufacturer and owned trademark rights to the name `Ignitron`. Ignitrons are closely related to mercury-arc valves but differ in the way the arc is ignited. T..... Found on http://en.wikipedia.org/wiki/Ignitron
electron tube functioning as a rectifier to convert alternating current (AC) to direct current (DC). Each conduction cycle is started by an external ... [1 related articles] Found on http://www.britannica.com/eb/a-z/i/7
a cathode-arc vacuum tube with an auxiliary electrode projecting into a pool of mercury: it conducts current when the anode is positive. Found on https://www.infoplease.com/dictionary/ignitron