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586 History of Three-Color Photography
L. C. Van Riper21 on the assumption that the red sensation lasts longer than the others, would project in the order red, green, red, blue for tricolor pictures and red, red, green for two-color. J. S. Higham22 utilized the same idea. J. Campbell23 patented the affixing of the appropriate color filter to each positive, or the color might be sprayed on or imbibed.24 In conjunction with Thompson-5 stencils were to be used to protect one picture ; or a quick-drying liquid,20 such as collodion might be used. The same inventors27 would apply colored celluloid or gelatin in the same way. A. J. Waggett28 also used colored strips of celluloid. This idea was followed by C. J. Coleman.29 Campbell & Thompson30 suggested the application of colored gelatin or celluloid to panchromatic negative stock, ana stripping after development, the exposure being through the base. L. Herzberg31 patented the local coloring of the positive, also F. Royston.32 W. B. Featherstone33 would make the celluloid colored in the first instance and then coat with emulsion. J. Shaw and J. W. Berwick34 proposed to use a resist of rubber to protect alternate pictures, or a continuous cloth with openings. L. F. Douglass35 would also locally apply the colors or tone each image.
Campbell & Thompson36 patented a shutter with a blue sector of 36 degrees with red and green sectors of 72 degrees. In a later patent37 the angles were made variable. The same thing wa£ patented by E. Zollinger and S. Mischonsiky.38 F. W. Hochstetter39 would provide a frame for the filters with reciprocating motion. In a modification40 the filters were arranged on a swinging arm, and a box-like arrangement41 was used. In another form42 a drum with radial tubes. Another form48 was a disk with spaced rectangular areas concentrically disposed, each carrying a plurality of color divisions. J. Shaw44 would do away with color bombardment by alternating the colors, thus red, green, red, yellow, red, blue for taking the negatives; but the positives were projected through red and green only. Later45 the colors were altered.
P. Richy46 proposed what he called a three-color system in which two vertically juxtaposed lenses were used with violet and green sector shutters. Positives were printed in orange and black for one film and in black and orange for the other film and these two films were projected through the taking filters, and the result was said to be all colors. Boudreaux & Semat47 would make a negative on panchromatic film, and color the positive by hand, then make negatives through filters from this and project positives through the same filters. A. Miethe48 used a colored sector shutter and projected in the same way. He contended that the trouble of flicker would be overcome by using a triple-width film. Zoechrome and T. P. Middleton49 patented a film that could be used for color or black and white. Exposures were made at the rate of 32 per second with a red, green and blue sector shutter alternating with yellow or white ones. The inventors seem to have had some peculiar notions, as the alternation of