拍品專文
Podlogar dates the Chronoscope to c.1910.
.jpg?w=1)
細節
Chronoscope Pap actinometer
French; with mounting foot, in maker's box
French; with mounting foot, in maker's box
出版
Miha Podolgar (1996), Exposure Meter and Cameras with built-in Exposure meter, Chronology 1818-1970, p. 31-32.