Title: Ion chamber, early
Date: 1922 (approximate)
Original Format: photograph: negative
Description: Smallest cylindrical electroscope with clock and photographic drum. Used by Millikan and Bowen in 1922. See Phys. Rev. 27:353 (1926). Mfg. CIT Physics Shop.
Collection: Scientific Instruments
Caltech Archives ID: ST-CR-10
