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

Page scan 000522 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 #:
000522
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 BOWEN RIBBON-FRAME CAMERA 519 Hewlett-Packard secondary timing standard. The shutter-timing record was assessable to an accuracy of about 0.5 microsecond. As mentioned above, the six shutter slots make possible a speed of 180 frames per second. By closing three slots, alternately around the drum, pictures can be taken at 90 frames per second. Four slots closed, leaving two openings 180 degrees apart, allows 60 frames per second; and all closed except one, allows 30 frames per second. In Fig. 4 — Operator of a Bowen ribbon-frame camera orienting the camera in respect to the trajectory by use of a gunner's quadrant. The small telescope on top of the camera is used for setting one of the needed angles. the camera type shown in Fig. 1, the exposure time is about 97 microseconds and the slot is either fully open or fully closed. In the CZR-1, however, various slides can be used in each shutter slot so as to give a shutter range from 100 microseconds to the 25 microseconds deemed necessary for future work. The film moves continuously at 30 inches per second so that at a frame speed of 30 frames per second, 3%0 of an inch or 1.0 inch of film is available for each frame. At 60 frames per second, the frame must be reduced to 3%o or 0.50 inch. Ninety frames per second allows 0.33