POWER CONTROL FOR DEFENSE
CD 1967074 E&MP120.001
December 20, 1940
Ignitron rectifiers, developed by Westinghouse research engineers to control electric power, are now being built for industries producing national defense materials.
In this photograph, a craftsman at the East Pittsburgh Westinghouse Works is shown checking the vacuum in one of several Ignitrons built for metallurgical applications.
These devices change alternating current into the direct current required in special processes.
Original Caption by Science Service