Lot Essay
Podlogar dates the Chronoscope to c.1910.
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Details
Chronoscope Pap actinometer
French; with mounting foot, in maker's box
French; with mounting foot, in maker's box
Literature
Miha Podolgar (1996), Exposure Meter and Cameras with built-in Exposure meter, Chronology 1818-1970, p. 31-32.