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

Page scan 000509 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 #:
000509
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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506 JONES AND EYLES November The spring-actuated shutter uncovers the lenses for about 5 milliseconds, during which interval 59 pictures are taken. For a speed of rotation of the disk of about 6000 revolutions per minute, a picture frequency of approximately 100,000 is obtained, the exposure time for each picture being of the order of 5 to 10 microseconds. The light transmitted by each lens is reflected, by a small surfacealuminized mirror placed at its rear, onto a strip of 35-mm perforated film two meters long, held round the inner periphery of a drum. Film is drawn from a lighttight cassette and can be returned to it for removal from the camera for processing. Crown Copyright Reserved Fig. 3 — Marley high-speed camera for taking photographs of highly luminous subjects, such as explosions, at speeds up to 100,000 frames per second. A group of eight photographs selected from a series made with the Marley camera at the rate of 76,000 frames per second of the detonation of a 2-pound charge of the explosive, tetryl, is shown in Fig. 5. Froome5 has published details of an interesting Kerr-cell system designed for repeat series exposures on a single plate, but adaptable for use with a drum camera or any camera using continuously moving film. The equipment consists of a standard type of Kerr cell, filled with very pure nitrobenzene, across which a potential of about 1000 volts is maintained. This produces further electrolytic purification