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

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 #:
00057
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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54 HARSH AND SCHADLICH July each bank is shown in Fig. 4. The jets are Vie inch from the film surface and opposite each jet tube are cloth-covered back-up rollers to support the film. It is important that the jets are regularly spaced and in this case the film passes a jet every 2x/2 seconds. The jet orifice is 1 X l/sz inch. The two pumps have 7V2-horsepower motors which supply up to 12 pounds pressure at the jet an4 circulate the solution at the rate of 500 gallons per minute. Fig. 5 — Sensitometric strip to measure bromide drag. To the best of our knowledge, this is the first time that high-pressure jet turbulation has been used effectively on a bottom-frictiondrive machine. As mentioned earlier, it is possible because of the uniform motion of the film. V NO JE.T AGITATION JET EVtflV 7 SECONDS JET C.VCRV 2'/i .JCCO.VDS Fig. 6 — Graphs showing effect of jet agitation. The importance of adequate turbulence in processing color film can be demonstrated easily. For example, let us consider its effect in eliminating bromide drag. In Fig. 5 a type of sensitometric strip is shown which is designed to measure this effect quantitatively. The opposite circular areas receive equal exposures but in one case the immediate surrounding area receives maximum exposure and in the other the immediate surrounding area receives no exposure. The difference in the measured densities of the circular areas after processing gives a good quantitative evaluation of the efficiency of the