Merchant, F. W. (Francis Walter), 1855-1937, Chant, Clarence Augustus, 1865-1956 · Toronto : Copp Clark · leaf 371
Fio. 427.—Diagram fortesting for astigma-tism. 360 OPTICAL INSTRUMENTS … Fig. 428.—a photographiccamera. plate In Fig. 428 is illustrated an ordinary camera. In the tube A isthe lens, 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 scene to be photographed issharply…
Physics
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