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 #:
00069
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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66 BERKLEY AND FELDT July and closing which, while it may give rise to the same integrated value of light, represents improper operation of the shutter. Such improper operation is readily displayed on the cathode-ray tube. Realizing all these advantages, many photographers today have devised elaborate oscillographic equipment to enable production testing of shutters.2"9 Such equipments are now being used by most camera manufacturers to check their shutter operation. I 1 I 1 |l! I j III! ','H mi UN nil II;! I I If r t I I i I i I i i I 111 tliii i i i i Fig. 1 — Focal-plane shutter characteristics. Shutter speed Vso second on a Graflex shutter — horizontal sweep approximately 1/2o second, (a) With low-frequency sweep approximately 600 cycles to show principle. Our previous remarks have all referred to the testing of betweenthe-lens leaf -type shutters. The cathode-ray oscillograph has also been applied successfully to the testing of focal plant shutters by a technique described by Bullock.2 This technique involves the photographing of a vertical oscillator trace on the cathode-ray tube and the sweep of this trace horizontally across the cathode-ray tube for a time somewhat longer than the operation time of the shutter. This pattern is then imaged in the focal plane. The sum of the cathode-ray-tube spot and focal-plane slit motions gives rise to