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Ready-made model of a mercury vapor direct current converter suitable for our industrial and colliery buildings.

A mercury vapor rectifier is a historical design of a gas discharge tube, which is operated as a rectifier and converts supplied alternating current or three-phase alternating current into direct current. The mercury vapor rectifier was developed by Peter Cooper-Hewitt in 1902 and was widely used in industry until the early 1970s (Q:Wikipedia)