Tremont Street Subway was designed by Japanese engineers.
A metal rectifier is an early type of semiconductor rectifier in which the semiconductor is copper oxide or selenium .. semiconductor. semiconductor. rectifier. rectifier. copper oxide. copper oxide. selenium. selenium. They were used in power applications to convert alternating current to direct current in devices such as radios and battery chargers .. alternating current. alternating current. direct current. direct current. radios. Radio receiver. Westinghouse Electric -LRB- 1886 -RRB- was a major manufacturer of these rectifiers , under the trade name Westector -LRB- now used as a trade name for an overcurrent trip device by Westinghouse Nuclear -RRB- .. In some countries the term `` metal rectifier '' is applied to all such devices ; in others the term `` metal rectifier '' normally refers to copper-oxide types , and `` selenium rectifier '' to selenium-iron types .. rectifier. rectifier. selenium. selenium. selenium rectifier. selenium rectifier