A vintage, 17 cm long, Tungar, Catalogue No. 189048, rectifier bulb. These types of rectifier bulbs were manufactured by General Electric and were used before the invention of solid-state rectifiers as half-wave rectifiers for the conversion of AC electrical currents into DC current. They were primarily used in the early days for charging batteries. This tube was part of a collection used at Chalk River by the Physics Division. The tube was donated in a box with a circuit drawn on the outside depicting usage in a 25 V dc application.
