The history of three-color photography (1925)

Record Details:

Title:
The history of three-color photography
Date:
1925
Publisher:
Boston : American Photographic Publishing Company
Volume:
The history of three-color photography
Leaf #:
000492
Language:
English
Subjects:
Motion Pictures, Motion pictures--Technology
Collection:
Books
Format:
Books
Contributor:
Media History Digital Library
Sponsor:
Media History Digital Library
Coordinator:
Media History Digital Library
Description:
Date Added:
September 21, 2023
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476 History of Three-Color Photography roller saturated with a hardening liquid, such as formaldehyde or chrome alum. Or the colloid might be mixed with certain substances, such as hypo and ferricyanide of potassium and the ruling roller be made of copper, when cuprous ferrocyanide would be formed and tan the colloid. If iron were used for the roller, then Berlin blue would be formed and this might be used as one of the colors of the screen-plate. *5 & Fig. 122. McDonough's U.S.P. 561,686 (Page 475). F. E. Ives7 proposed to obviate the difficulty of ruling linear screens by making negative records through a black and white screen, and shifting the same for each exposure, the latter being made through color niters, thus following Anderson and Brasseur & Sampolo. For viewing the resultant transparencies, it was suggested to use prismatic plates, as shown in Fig. 125, with three differently colored light sources, so placed that the lines over the red, green and blue elements refracted or transmitted to the eye, only the corresponding colored light. The best theoretical conditions for carrying out this idea involved three separate but sufficiently powerful light sources, with a separation equal to about 3 degrees of arc from the observer, and at sufficient distance to make all the utilized rays approxi