Improvements relating to the manufacture of alternating current rectifiers of the selenium type

摘要

554,894. Asymmetrically-conducting resistances. WESTINGHOUSE BRAKE & SIGNAL CO., Ltd., THOMPSON, L. E., and JENKINS, A. Jan. 21, 1942, No. 872. [Class 37] The selenium-mixture layer of a rectifier has small quantities-e.g. 0.04 per cent-of antimony added to it. Specifications 523,673 and 529,791 are referred to.