'Speedivac' high vacuum pump and compressor

"Speedivac" high vacuum pump and compressor, model 1SC30, serial no. 928, by W. Edwards and Co. (Ldn.) Ltd., London, England, belt driven from 0.25 h.p. a.c. motor type BS2408 no. D30003T, by British Thomson-Houston Company Limited, British, 1950-1955. Mounted on a common base plate.