Journal of the Society of Motion Picture Engineers (1930-1949)

Page scan 000269 from Journal of the Society of Motion Picture Engineers

Record Details:

Title:
Journal of the Society of Motion Picture Engineers
Date:
1930-1949
Publisher:
New York, N.Y. : The Society
Volume:
Journal of the Society of Motion Picture Engineers
Leaf #:
000269
Language:
English
Collection:
Technical Journals
Format:
Periodicals
Contributor:
Prelinger Library
Sponsor:
MSN
Coordinator:
Media History Digital Library
Description:
The Journal of the Society of Motion Picture Engineers (SMPE)Êdocuments the technological progress of the film industry, highlighting technical developments in production and exhibition. Of special interest are articles about special effects, theater practices, lighting, and the introduction of the 16mm format. Initially titled "Transactions of the Journal of the Society of Motion Picture Engineers."Digitized by the Prelinger Library and the Library of Congress Motion Picture, Broadcasting and Recorded Sound Division.
Date Added:
July 19, 2022
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256 J. M. CALHOUN Vol 43, No. 4 on the permanent shrinkage of film during aging after development is illustrated in Figs. 15, 16, and 17. A comparison of the permanent shrinkage of strips of film suspended freely in circulating air, and film wound in tight rolls in untaped, and in taped cans is shown in Fig. 15. Free access to the air enables solvents and other volatile material to diffuse out of the film more easily and, therefore, accelerates shrinkage. Fig. 16 shows the effect of relative humidity at constant temperature, on the rate of shrinkage of strips of nitrate 1.4 ~0 I 2 3 4 TIME MONTHS FIG. 17. The effect of temperature on the rate of shrinkage of processed Eastman Safety 16-mm Reversal film (Type No. 4, Table 4) in the lengthwise direction at 20 per cent RH. (Film in strips having free access to air.) motion picture positive film hung in circulating air. As mentioned previously, moisture aids the diffusion of solvents through both the base and the emulsion, so that the film shrinks more rapidly at higher relative humidities. Fig. 17 illustrates the effect of temperature at constant relative humidity on the rate of shrinkage of Eastman Safety 16-mm Reversal Film. Heat drives out some of the residual volatile material from the film base, thus accelerating shrinkage. The influence of the various storage variables on the rate of shrinkage described above applies qualitatively to the majority of motion