noun
mercury arc valve; mercury vapor rectifier
Technical term in electrical engineering for a rectifier that uses a mercury pool cathode.
水銀整流器は、かつて高電圧直流送電に使われていた。
Mercury arc valves were once used in high-voltage direct current transmission.
General term for a rectifier; 水銀整流器 specifically uses mercury.
Compound of 水銀 (mercury) + 整流器 (rectifier).