The history of three-color photography (1925)

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Screen-Plate Patents 489 coating a third time. This would produce a film with the three colored lines or mosaic, but there would also be superposition of the colored gelatins and the film was to be planed down till only three colors showed. H. Snowden Ward,80 when speaking of the McDonough-Joly process, said: "Dr. Joly patented a method of making such screens (or lightfilters) by laying dyed silk across a glass support; and he made a still more interesting and promising suggestion. This was to take a great number of sheets of colored gelatin, alternating red, green and violet, and / —CL z. A 7. TTTTTTTT TTTTfTTTT TTfTTTTTT^ TTTfTTTTT TTTTTTTT?1 ITVTTTTTTT 10. Fig. 128. Smith's E.P. 6,881, 1906 (Page 490) lay them down in a great pile, like the leaves of a book, until the edges of the sheets should cover an area equal to that of the desired screen. Then by cutting sections across the edges (at right angles to the surfaces of the sheets) it would be possible to make a great number of thin films each consisting of the desired colored lines." The author has not been able to verify this statement, but it would look as though Joly was the first to suggest, possibly simultaneously with Witt, this method of making screenplates.