We use Optical Character Recognition (OCR) during our scanning and processing workflow to make the content of each page searchable. You can view the automatically generated text below as well as copy and paste individual pieces of text to quote in your own work.
Text recognition is never 100% accurate. Many parts of the scanned page may not be reflected in the OCR text output, including: images, page layout, certain fonts or handwriting.
Screen-Plate Patents
491
very little sizing, was coated with gum arabic or other water-soluble matter, then with a coating of soft pyxroxylin, the screen printed on this and transferred to glass or other support, and stripping the paper. There is also disclosed three transfers. J. S. Szczepanik83 would print fine lines so as to cross. The several phases in the production of such a screen are shown in Fig. 129. It will be seen that not only are there black but white areas as well, and the results in the positives from such plates must be degraded in color.
H. W. H. Palmer84 would arrange the elements in a "key" pattern, and after printing one color, shift the block and print in the second and then the third in the same way. The three stages in the process being shown in Fig. 130. Metal type could be used, or etched plates, or dichromated colloids, and the print photographed down. Printing from rubber or celluloid or the offset process might be adopted and the process was
Fig. 130. Palmer's E.P. 8,761, 1910.
said to be particularly suited for cinematographic films by using rollers. Paper coated with such a screen-pattern could be sensitized with print-out emulsion, and thus the commercial production of color prints would be rendered possible.
G. Valensi85 would form the elements with contiguous hexagons about 0.001 mm. These might be produced by photographing on a reduced scale, designs in black and white. The elements were to be produced on both sides of a film, the red on one side, the yellow on the other ; the blue being obtained by resensitizing and printing through the existing elements. Thvs was stated to be particularly suitable for cinematography.
C. L. A. Brasseur86 also proposed to print regular screens from a copper plate. I. Kitsee87 patented the formation of screen-plates by photographing the patterns on to rollers, etching and printing. A. Nodon88 would use a transparent and flexible support with greasy litho or typographic ink lines in two colors horizontally and others angled so that in a square there