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

Page scan 000644 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 #:
000644
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 AIK COOLING OF FILM 641 back to Figs. 1 and 2, we note that clear film is almost completely transparent in this same range. In other words, the absorptions of film base and of film emulsion representing a transparent area in the photographic image are negligible. (The difference between actual WAVELENGTH MICRONS Fig. 3 — Relative energy emission of selected projection light sources. The amount of energy emitted at the various wavelengths (uncorrected for absorption by condenser lens, and so forth) for arc and incandescent projection sources. The curves are drawn with equal total energies. Note that although a black-body radiator at 6000 degrees Kelvin gives an approximate color match to high-intensity arc radiation, it is not so satisfactory an approximation to total energy distribution. Curve Description 1 High-intensity carbon-arc crater 2 Black-body radiator at 6000 degrees Kelvin — an approximate visual match for the high-intensity arc 3 Black-body radiator at 3000 degrees Kelvin— an approximate match for the output from a tungsten projection lamp transmission and 100 per cent transmission of the film samples measured is almost completely explained by the reflection losses at the two film-air interfaces.) It will be seen further that the production of a silver image in the emulsion layer, represented by Curves 2, 3, and 4 in Figs. 1 and 2, results in the absorption of energy in a manner that is approximately nonselective over the interval from 0.3 to 2.8 microns.