Transactions of the Society of Motion Picture Engineers (1929)

Record Details:

Title:
Transactions of the Society of Motion Picture Engineers
Date:
1929
Publisher:
New York : Society of Motion Picture Engineers
Volume:
Transactions of the Society of Motion Picture Engineers (1929)
Leaf #:
000389
Language:
English
Subjects:
motion pictures, Cinematography -- Periodicals
Collection:
Technical Journals
Format:
Periodicals
Contributor:
Library of Congress, MBRS, Moving Image Section
Sponsor:
Library of Congress, Motion Picture, Broadcasting and Recorded Sound Division
Coordinator:
Media History Digital Library
Description:
Preceeded by an unnumbered issue published in 1916 called: Incorporation and by-laws
Date Added:
November 17, 2022
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Fixing Baths — Crahtree and Hart 373 The time required for fixation of any emulsion depends on several factors as follows: (1) (2) (3) (4) (1) The nature and thickness of the emulsion. The nature and degree of exhaustion of the fixing bath. The temperature of the fixing bath. The degree of agitation of the film. In general, coarse-grained emulsions fix much more slowly than those composed of finer grains. For example, under any given conditions Eastman motion picture positive film fixes in about onefifth the time required for Eastman negative motion picture panchromatic film. A thickly coated emulsion obviously fixes more slowly than one of less thickness. (2) The times of fixation for various concentrations of sodium thiosulfate at 55° P., 65° F., and 75° F. for Eastman motion picture positive and negative panchromatic film are shown in Fig. 2. The >K^^5^•^ concentration: GRAMS WLt JtOj • SHjO /UTER 50Um»M Figure 2. Curves showing the time to clear Eastman motion picture positive and negative film in hypo solutions of various concentrations at different temperatures. negative film fixes most rapidly in" a 40% solution which corresponds with the results of Piper^° with Lumiere film, while with Eastman positive motion picture film a 30% solution gives the most rapid fixation. Some workers have contended that the hardening of a gelatin film does not affect the rate of fixation while others maintain that it does. Sheppard and Mees" found that formalin hardening does