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 #:
000384
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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.-» .s .6 TIME IN MILLISECONDS Fig. 6. Enlargement of an original record and method of plotting pressure-time curve. be placed between the diaphragm and the metal support. As the diaphragm deflects, the oil must flow along the face of the diaphragm to accommodate the change in volume between the diaphragm and the metal support. Damping is caused by the viscosity of the oil. Decreasing the clearance between the support and the diaphragm will increase the velocity of the oil and hence its damping action. A 0.040-in. diaphragm with a pressure range of 0 to 70 psi is critically damped if a 1000-centistoke oil drop is used with a clearance of about 0.004 in. Figure 5 also shows the diaphragm damper and filter unit combination. The damping fluid is held in place between the metal plate and the diaphragm by its surface tension. After several months of field use, diaphragms have been inspected, and the oil drops have been found to be intact and damping properly. As these gauges are intended for field use of the most exacting kind, it was found necessary to put a water and dust filter over the diaphragm proper. The material used for this filter has the trade name "Porex." It is manufactured by W. E. Buck: Pressure Recording With Interferometer Camera 375