The history of three-color photography (1925)

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558 History of Three-Color Photography sents a negative of the same through a red filter; 4 the same through a green filter ; 5 is a face view of the green-lined element enlarged and 6 is the same of the red unit; 7 is an enlarged face view of a positive made on the green ; 8 is a diagrammatic section of one of the sensitive elements with the opaque reflecting backing broken away. The support might be celluloid or glass with the elements spaced apart so as to leave clear spaces or windows through which the other colors were seen. M. C. Hopkins5* would also use a process on similar lines. Fig. 147. Stinchfield's U.S.P. 1,364,958 (Page 557) J. Szczepanik55 would coat a print-out emulsion on a mosaic, and then on top of this a panchromatic emulsion. The former would not be affected during the camera exposure, and was to be exposed through the negative, the primary image not being reversed. The negative was stripped off. S. SchapovalofF6 devised a screen-plate in which the elements were stained so that part of the coloring matter was removable after exposure, the remainder giving the correct colors. After removal of the temporary color the support with the image might be attached to paper. J. H. Smith57 proposed to make prints by the bleach-out process and patented a special wing mirror printing frame. J. Szczepanik58 stated that