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Cinematography in Colors 603
order that it will see lines separate, if their period (twice their separating distance for lines of equal width to the spaces I is one-thousandth of their distance from the eye. Thus the screen unit must not be more than 2. 54 mm. on the projection screen, and if the magnification is as stated above, we find that the actual size of the unit must be 0.015 mm.
Some inventors have been rash enough to put on paper at least, what they consider possible methods of using the screen-plate process. L. Vidal201 suggested the use of the Joly screen for Edison's Kinetos F. W. May and E. Judsoir" ''-' would utilize a transfer process, and paper was coated with dichromated gelatin, exposed to light and then after washing and calendering, the gelatin was rubbed over with wax in benzol and a second coat of plain gelatin and sugar applied, which was termed the "transfer." The colored elements might be applied in the form of lines or dots in a resist, and the dyes might be mordanted by ferric chloride. F. W. May203 patented the production of a screen-plate or film, in which a resist of gelatin in lines was applied to a gelatin-coated support. The film was to be hardened and the color applied in the free spaces, then the surface treated with formaldehyde, ferric chloride or aluminum acetate. The resist was washed off and the process repeated for the other colors.
H. A. Dorten204 would make his negative by the screen-plate pro« make a positive from the same, project the picture and make three constituent negatives with successive pictures, or by separating each color record, then the positives could be made as usual and projected with a rotary shutter. In a later patent205 the same inventor would make a color positive film by a screen process and then enlarge this about five diameters, copy through the usual filters on to three films three times the normal width, each picture being exposed by itself. Then from the negative thus obtained positives could be made as usual.
H. Workman206 proposed to apply the screen elements to the positive film made from a screen negative, by mechanical means. Fig. 167 represents one of the various patterns that might be employed : / shows the arrangement of the camera with the lens a, b the film was fed in the usual way, and c is the gate, d the sectional color screen, "disposed therein so as to be in contact or nearly so with the front of the film." The positive was to be made from the negative thus obtained, and it is clear from the wording that the negative was merely a black and white one with the image broken up into the screen pattern. To the positive the color elements were now to be applied by mechanical impression, dyeing or a combination of both. It may as well be pointed out that in "nearly so" contact with a screen-plate is useless, as there can be no possible accurate pattern thus obtained. The negative taking screen is shown in 2, R, (7. B standing for the colors red, green and blue. The three printing surfaces are shown in 3, 4 and 5. H. Tress*01 patented an aperture plate with