Society of Motion Picture Engineers : incorporation and by-laws (1927)

Page scan 000730 from Society of Motion Picture Engineers : incorporation and by-laws

Record Details:

Title:
Society of Motion Picture Engineers : incorporation and by-laws
Date:
1927
Publisher:
New York : Society of Motion Picture Engineers
Volume:
Transactions of the Society of Motion Picture Engineers (1927)
Leaf #:
000730
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:
September 12, 2024
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714 Transactions of S.M.P.E., Vol XI, No. S2, 1927 water and swelling, that is, increasing its volume from the very start. On further examination of this peculiarity, it was found that the initial contraction vanished when the water was kept below a certain temperature and further that the temperature at which the contraction appeared depended upon the thickness of the gelatin layer. SWELLING OF ASH-FREE GELATINE IN DISTILLED WATER AT20''C. 40 35 30 ZS 20 15 10 5 0 -5 -10 -15 -20 , i A A ff^ h/ <i / f/ ^ r^ i ^ i A PHIC G0,6 KNE .c dS 047 CM. B c 68,5 56,5 9 .C 7 .( 070 100 CM. CM. 20 40 60 80 100 120 TIME (MINUTES) Fig. 5. 140 160 ISO Y\ ithout at this time attempting anj^thing like a complete explanation of this behavior, this is further evidence of the forces at work in swelling which are tending to effect a rearrangement of the particles in the gelatin layer. Sequence of Swelling Effects in Photographic Processing When a photographic film is run through a treatment in which it passes from plain water to an alkaline developing bath and then