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

Page scan 000642 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 #:
000642
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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1949 AIR COOLING OF FILM 639 the Zavesky, Null, and Lozier figures with no shutter or absorbers "instantaneous flux"; the values measured with 110 shutter but with other normal absorbers (draft glasses, heat-absorbing glass, and so forth) "instantaneous net flux"; and the values including shutter plus other absorbers "mean net flux." 5 60 WAVELENGTH MICRONS Fig. 1 — Spectral transmission of Eastman nitrate fine-grain release positive, Type 1302. The transmission in the ultraviolet, visible, and infrared of nitrate positive having successively increasing silver densities. Curve Image Visual Density 1 Cleared, no silver 0 . 04 Silver, uniform flash 0 . 58 3 Silver, uniform flash 1 . 10 4 Silver, uniform flash 2 . 10 Our data indicate that the factor influencing film behavior in theater projection is best represented by this figure of "mean net radiant flux" upon the film. HEATING OF FILM Film is heated during projection because the photographic image has a net absorption for radiation, both visible and infrared; in addition, it transmits some radiation and scatters some radiation, and, as its temperature rises above that of the surroundings, it loses energy by convection to the air and radiation to the surroundings. All of the net