Merchant, F. W. (Francis Walter), 1855-1937, Chant, Clarence Augustus, 1865-1956 · Toronto : Copp Clark · leaf 188
ows B this ismoved back and forth until the sceneto be photographed is sharply focussedon the ground glass. Then a holdercontaining a sensitive plate or film isinserted in front of the frame 6, thesensitized surface taking exactly theFig. 213.-a camera. positiou previously occupicd by the ground…
Physics
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