The history of three-color photography (1925)

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490 History of Three-Color Photography Photomechanically Printed Screen-Plates. — This class is a somewhat small one, probably due to the difficulty of making the original printing plates with fine enough elements and secondly to the difficulty of the transfer of the colors. J. H. Smith81 would employ unit areas regularly distributed, such as equilateral triangles, and their combinations to regular hexagons and rhombuses, which lend themselves to the purpose without overlapping. 3.™ Fig. 129. Szczepanik's E.P. 6,098, 1907. Six elementary colors could also be used. This regular distribution was obtained by arranging round every central point where the unit areas met, all the colors employed in the screen. In Fig. 128 are shown some of the units that might be employed ; 1 shows equilateral triangles ; 5 the three colors grouped round every point where the hexagonals meet. J. H. Smith, W. Merckens and H. B. Manissadjian82 pointed out the difficulties of obtaining good results by ordinary photomechanical printing and would use intaglio steel or copper plate printing. Soft paper, with