Merchant, F. W. (Francis Walter), 1855-1937, Chant, Clarence Augustus, 1865-1956 · Toronto : Copp Clark · leaf 371
special kinds ofglass and have surfaces with specially com-puted curvatures, they are expensive. Great eflfort and marvellousingenuity have been expended in producing the extremely compactand efficient cameras now so familiar to us. 413. The Projection Lantern. In Fig. 430 is shown hvertical… … -Section of aZeiss Tessar photo-graphic objective. Thelight enters in the direc-tion shown by the arrow.
Physics
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