Used from about 1930 on. See Phys. Rev. 27:235 (1931). In good working condition as of 1/70. Victor Neher described it as a “high pressure ionization chamber” with 30 atmospheric pressure. It was, he said, used more than other instruments by RAM and was sunk in Muir Lake. This instrument is the most valuable of its type. Mfg. CIT Physics Shop.
ID number
ST-CR-06
Title
Potentiometer, white double
Abstract
Serial no. 209395. The instrument is described in Leeds and Northrup Bulletin no. 726 (1927). Purchased by CIT in 1950. Mfg: Leeds and Northrup Co., Philadelphia, PA.
ID number
ST-PH-20
Title
Ion chamber, early (C)
Abstract
Large cylindrical electroscope used by Millikan in early cosmic ray research. Mfg. CIT Physics Shop.
ID number
ST-CR-12
Title
Rheostats (3)
Abstract
On 13” inscribed: “Central Scientific Company 22.5 Ohm 4.4 Amps”.
