Merchant, F. W. (Francis Walter), 1855-1937, Chant, Clarence Augustus, 1865-1956 · Toronto : Copp Clark · leaf 370
of a cylinder instead of a sphere. 412. The Photographic Camera. The pin-hole camera wasdescribed in §333. This would be quite satisfactory for takingphotographs, except for the fact that as the pin-hole is very small,little liglit can get through it and so the time of exposure is long.This serious… … Fio. 427.—Diagram fortesting for astigma-tism. 360 OPTICAL INSTRUMENTS In Fig. 428 is illustrated an ordinary camera. In the tube A isthe len.s, and at the other end of the apparatus is a frame C con-taining a piece of ground glass. By meansof the bellows B this is moved back andforth until the…
Physics
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