The history of three-color photography (1925)
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102 History of Three-Color Photography
79. U.S.P. 727,524, 1903; F.P. 331,760; E.P. 10,240, 1903.
80. U.S.P. 599,670, 1898.
81. D.R.P. 147,925, 1903; Silbermann, 2, 352; U.S.P. 767,880, 1904; E.P. 4,962, 1903; F.P. 330,023; Belg.P. 170,211, 1903.
82. E.P. 10,951, 1904; Brit. J. Phot. 1905, 52, 353; D.R.P. 169,018, 1905; F.P. 352,193 ; Phot. Coul. 1906, 1, Supp. 4.
H. Schmidt, E.P. 20,954, 1904; Brit. J. Phot. 1905, 52, 96; F.P. 346,614, 1904, and J. E. Thornton, E.P. 11,346, 1906; Brit. J. Phot. 1907, 54, 546, patented the same thing.
83. E.P. 16,659, 1904.
84. D.R.P. 213,773, 1906; E.P. 25,728, 1906; abst. Brit. J. Phot. 1907, 54, 925 ; U.S.P. 922,908, 1909. How the wax was removed before development is not stated.
J. A. Scherer, D.R.P. 191,425, 1903, patented an endless band carrying the tri-color filters, which were changed with the change of the film. A. Kolbe and E. Tiedemann, D.R.P. 172,049; 172,050; 172,238, 1904, patented a changing plateholder, in which the plate and filter were brought into the focal plane by means of frames turning on a central pin.
85. D.R.P. 213,773; E.P. 25,728, 1906; U.S.P. 922,908; Wag. Jahr. 1909, 55, II, 515; Brit. J. Phot. 1907, 54, 926.
86. U.S.P. 888,684, 1908; Can.P. 103,761.
J. A. Hatt, U.S.P. 1,013,937, 1912, used a rectangular block of glass with central aperture for the liquid and flat side plates, that were temporarily cemented with wax or paraffin. W. F. Folmer, U.S.P. 1,104,179, 1914, patented a rubber ring with a shoulder, against which the filter disk was pressed, while raised ribs held the same to the lens tube. W. Frey, U.S.P. 1,174,930, 1916; E.P. 22,771, 1914; Brit. J. Phot. 1915, 62, 386; abst. Phot. J. Amer. 1915, 52, 407; D.R.P. 200,388, 1907, patented the old idea of placing filters in front of arc lamps. R. John, U.S.P. 1,216,696, 1917, proposed to overcome the disadvantages of sunlight by using colored reflectors behind nitrogen lamps, which should diminish the blue and increase the ratio of the other colors. J. Verfurth, D.R.P. 275,273, 1914, patented a filter holder with centering screws. E. J. Wall, Brit. J. Phot. 1908, 55, Col. Phot. Supp. 2, 28, suggested a green arc light, produced by silver and copper in the core of the carbons. Cf. Penrose's Annual, 1907, 13, 97.
87. U.S.P. 1,182,485, 1919.
88. U.S.P. 1,293,039, 1919; Brit. J. Phot. 1919, 66, 48; J. Ind. Eng. Chem. 1919, 17, 454; abst. J. S. C. I. 1919, 38, 118A, 305 A; Annual Repts. 1919, 3, 513.
J. Owen, E.P. 25,304, 1899; Photography, 1901, 217; Phot. Chron. 1901, 8, 363; U.S.P. 644,151, 1900, would combine the filters with half-tone screens, either by making the screen by photography and staining the film, or flowing the screen with the dye solution, or cementing the filter to its surface. H. J. Burton, Brit. J. Phot. 1896, 43, 152, gave a method of making a cell for liquid filters at a very reasonable cost. H. Gamble, U.S.P. 1,102,902; 1,102,903; D.R.P. 322,010; E.P. 6,768; 15,300, 1912; Phot. J. 1914, 54, 359; Brit. J. Phot. 1914, 61, 861; abst. Phot. J. Amer. 1915, 52, 61; Can.P. 152,702; F.P. 454,508; Amer. Printer, 1917, 57, would improve the rendering of the red-printing plate by special illumination of the copy whilst making the negative ; by first making a negative of the same through the red filter, and projecting this negative by means of an arc light on to the picture, whilst the actual working negative was being taken through the green filter. M. Johnson, J. S. C. I. 1921, 40, 176T; J. C. S. 1921, 120, 690i ; C. A. 1922, 16, 2993, gave methods of preparing tartrazin and similar dyes of the pyrazolone class ; but found that none gave better results, as regards absorption, than tartrazin. O. Will, D.R.P. 309,167, 1917; Wien. Mitt. 1920, 29; Jahrbuch, 1915, 29, 114, patented a filter for distant photography, composed of two wedges cemented between glasses ; the wedges might be of different colors and their slopes in the same or opposite directions. Kopp and Joseph, D.R.P. 253,334, 1911, claimed the use of coumarin derivatives, containing hydroxyl, amino, carboxyl or benzol rings, as ultra-violet absorbents. E. F. Beckwith, E.P. 25,055, 1902, patented a graduated color screen, composed of a prism of colored glass, cemented to a colorless prism of equal angle. In another form the colored glass was made as a concave lens and cemented to a plano-convex to form a parallel plate. W. F. Butcher, E.P. 23,658, 1903, patented a series of filters fitted in the periphery of a wheel on the lens front, so that each could be brought into the optical axis. O. Oeser, D.R.P. 209,396, 1907; Chem. Ztg. 1909, 33, 414; Phot. Ind. 1909, 702, patented a coater for filters, either of gelatin or collodion, by means of which it was claimed very