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THE ENGLISH DUFAYCOLOR FILM PROCESS* W. H. CARSON** Summary. — The Dufay color three-color additive system of color cinematography, employing a geometrical color-screen or reseau imprinted on the film base, is briefly described. As many as a million color elements per square inch are employed, and a correct color balance is achieved by adjusting the area covered by the blue dye in relation to that covered by the two other primary colors. No appreciable changes of equipment are required in applying the system commercially, either in photo- graphing, processing, or projecting, from what is now found in use. Many may wonder at the presentation of a paper on a subject as old in color photography as a color-screen process. However, the developments of the past two years have proved the process to be no longer in the theoretical and experimental stages but on a practical and commercial basis, and for that reason a discussion of the new Dufaycolor system seems to be in order. Any engineering group may rightly be skeptical of the recom- mendation or adoption of any innovation in the industry that can not conclusively demonstrate its basic soundness in both the theo- retical and'practical fields. However, past experience has shown that new scientific developments and improvements must be injected into the industry from the bottom up rather than from the top down. The introduction of sound into the motion picture industry came after years of research and the expenditure of millions of dollars in experimentation, which have been little recognized by the layman or the box-office patron. It was only through the tremendous pres- sure brought to bear by the sound technicians who visualized its future that it was finally grudgingly accepted by the producer and exhibitor and even more reluctantly by the public. Today it is impossible for silent productions to compete with talking pictures. The whole technic of producing silent motion pictures, including * Presented at the Spring, 1934, Meeting at Atlantic City, N. J. ** New York, N. Y. 14