Laboratory Standard Air Condenser, no.701, by H.W. Sullivan, made in April 1921 and modified in October 1933, Range 250-5100 picofarad Laboratory Standard Air Condenser 1921
No. 3 standard air condenser, with case, by Latimer Clark, Muirhead and Co. Ltd. No. 3 standard air condenser, with case, by Latimer Clark, Muirhead and Co. Ltd.