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610 History of Three-Color Photography
from 1/1000 to l/2000ths of an inch, and stagger the lines, as shown in Fig. 171, in which R, G, B represent the colors. The filter lines were to be removed by washing ; the result being merely a linear negative in black and white, from which a positive was made as usual. This positive was then ruled with the necessary lines and it was claimed that marked sterescopic effect as well as colors was obtained. L. Herzberg2-7 proposed to use colored threads pressed into celluloid. The Aktiengesellschaft f. Anilinfabrikation2-8 patented the coating of celluloid with the elements by passing it through a liquid and forcing the elements into the latter and allowing them to deposit on the film.
W. V. D. Kelley and C. H. Dunning2-0 proposed to use a line or regular screen for two, three or four colors. A symmetrical pattern screen, 7 in Fig. 172 was to be used, two colors only being here shown. The picture was taken through this screen, while above the picture-taking lens was arranged another one 3 fitted with a right-angled mirror or prism 4 above the base of which was placed a diffusing surface, such as ground glass ; a filter 6 also being used. The negative film was pulled down two picture spaces at a time and the screen pattern impressed in alternate sequence with the pictures. It is stated that where the color-values were recorded correctly in the negative, regardless of the subdivisions of the spectrum used, that it was possible to reproduce them satisfactorily with but two projection colors. The positive film was preferably doublecoated and the picture areas were all printed in successive areas on one side of the film, and the design or pattern on the other. And assuming that the filter 6 be greenish-blue, it is obvious that the red lines of the pattern will be clear in the negative and dense in the positive, and can then be dyed or toned red, while the alternate lines, which are dense in the negative and clear in the positive will be stained green. Thus would be formed an additive screen-film, capable of projection in any machine.
J. YV. Flender230 patented an extraordinary idea in which a negative was taken in the usual manner, and a positive made therefrom by exposing in contact with a black and white matrix screen and projecting this positive on to a screen, bearing a mosaic pattern. It was said that : "the resulting pictures will have depth and color tone, and will accurately show, either in black and white or in colors, the color values of the original settings/' C. Dupuis231 proposed to obtain either still or cinematographic pictures by a screen-plate, either on one or several plates or films, and then to print on to polished silver that had been superficially coated with silver subchloride. formed by electrolysis, as suggested by Becquerel for the Seebeck process. It was stated that the picture could be projected 175 times without alteration of the colors.
W. V. D. Kelley2 v would imprint the sensitive surface with lines by the action of light and then to issue the same so that the user might print his picture on the same mordant the lines after development, with suitable