Merchant, F. W. (Francis Walter), 1855-1937, Chant, Clarence Augustus, 1865-1956 · Toronto : Copp Clark · leaf 370
f a cylinder instead of a sphere. 412. The Photographic Camera. The pin-hole camera wasdescribed in ^ o3.3. This would be quite satisfactory for takingphotographs, except for the fact that as the pin-hole is very small,little light can get through it and so the time of exposure is long.This… … Fio. 427.—Diagram fortesting for astigma-tism. 360 OPTICAL INSTRUMENTS
Physics
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