Image: General electric pliotron pp schenectady 3

Description: General Electric Pliotron: Small glass tube with metal and plastic components; main body of the tube is tear drop in shape and tapers at the bottom into a plastic fitting that has four circular pins; inside the tube are two vertical glass rods that support a series of metal grids and small electrodes. Invented by Irving Langmuir in 1915, the Pliotron is the first true vacuum triode (a three electrode vacuum tube).
Title: General Electric Pliotron
Credit: Chemical Heritage Foundation
Author: Staff photographer
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