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July, 1934] ENGLISH DUFAYCOLOR FILM PROCESS 17 reason the geometric matrix or reseau, as it is termed, seems to have a decided advantage. It is believed that the Dufay system is the first screen process in which projection from standard 35-mm. film to theatrical screen size has been seriously attempted. The application of a reseau of this kind to a film base by mechanical means, on a regular and comparatively inexpensive commercial basis, further seems to enhance its value as an acceptable medium for use in the professional motion picture field. The idea of applying a series of colored lines or squares to the film base, originally suggested by Vidal in 1895, was used by Dufay in the further development of the process under discussion, wherein a contiguous series of red and green squares (or any two of the primary colors) were placed alternately between lines of blue (or the third primary color). Theoretically it would not seem to be of great im- portance as to what order was used in the application of the three primary colors. In practice it was found that on account of the high visual contrast of the blue line, the screen so constructed was much more visible when magnified to the extent necessary in motion pic- ture work than a different arrangement. At present the screen is produced with blue and red squares and a green line, which has the effect of reducing the visibility of the screen on projection. It is obvious that the smaller the area of each individual unit, the more perfect will be the blending of the color units by the eye, even upon excessive enlargement, and the less the effect on image definition. It was formerly believed that fifteen lines to the milli- meter was the limit of practical mechanical production, but within the last year a screen having nineteen lines to the millimeter (i. e., one thousand lines and spaces to the inch) has been very satisfactorily produced, and recent improvements point to a still further reduction of the line width. Even with the present line width it has been found that the reseau is not visible beyond the first six rows of the seats in the average theater. This provides the present screen with ap- proximately a million color elements to the square inch, and further diminution will have a progressively startling effect in definition and luminosity. The statement that such a screen or re*seau can be produced mechanically, consistently, in large quantities, on a commercial basis, and at a reasonable cost, will bear some scrutiny; so the first question that arises is, has it been done? The answer is that it is now being done by a reputable and well-known English manufacturer on 21-