While working towards a PhD in astronomy at the University of California at Berkeley in the mid-1930s, Gerald Kron (1913-2012) built this photoelectric photometer and tested it on the 36-inch refractor at the Lick Observatory on Mt. Hamilton. The photometer remained in use for several decades.
Ref: Gerald E. Kron, “The New Photoelectric Photometer of the Lick Observatory,” Lick Observatory Bulletin 499 (1939): 53-56.
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