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Scientific American, Vol. 57, No. 13 (1887) (1887)

leaf 7

An illustration from Scientific American, Vol. 57, No. 13 (1887), 1887, leaf 7
self With the eye in position a perfect stream of heated air is reversed for the larger lenses. These are rotated in entirely to his favorite occupation. Thirty years ago the factory was removed to its present location. The The hand held father isdead. His two sons, including the founder of face.… … the piece as stand the test are used. tained. TESTING PHOTOGRAPHIC OBJECTIVES. In these methods the rays of light Often a lens is cut from the center, pass twice through the lens, so that a while the corners have to be rejected. doubling of the effect due to a misshape is obtained. The manufacture…

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