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What device, invented by Peter Cooper Hewitt in 1902 and obsolete by 1975 with the introduction of devices..............

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What device, invented by Peter Cooper Hewitt in 1902 and obsolete by 1975 with the introduction of devices such as the silicon diode and thyristor, converts alternating current to direct current by means of putting electricity through vapor?

posted Aug 19, 2021 by Nikita Sehgal

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Mercury arc rectifier
Mercury arc rectifiers were widely used until the 1960s for the production of direct current for streetcars, electric railways, large radio transmitters, and some DC power grids in urban centres. They are still used in some South African mines and the Manx Electric Railway.

answer Aug 20, 2021 by Samardeep Acharya
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