h a patent has to the red light during development any more than is MM, is removed and replaced by a small eyeglass, P, been granted to Mr. Daniel Corcoran, of Yonkers, N. Y. absolutely necessary. and the camera is held near a window with its back at It will be noticed that the blue screen—the an… … Fig. 2.—USING THE CAMERA FOR VIEWING THE sheets of paper. These are cut the proper size POSITIVE IN COLORS. and stuck on the back of the plate before
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