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 #:
000568
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 CATHODE-RAY OSCILLOGRAPHY 565 Under certain conditions X-ray fogging may be encountered because of the high accelerating voltages used. The X rays generated are generally so soft that they will not penetrate the cathode-ray tube or the camera. Any X-ray fogging usually originates outside the camera or cathode-ray tube from sources such as rectifier tubes or surge equipment. Simple shielding will obviate this. RANDOM PHENOMENA Where it is required to record random or drifting phenomena, certain advantages in the presentation of the data can be obtained by (a) Single-frame recording of motor-starting current. (b) Continuous-motion record of same phenomenon. (Note increased amount of information.) Fig. 17 carefully considering whether the recording should be made on a single frame or with a continuous motion camera (Fig. 17). These recordings show a motor-starting characteristic. The continuous-motion recording enables study of much finer detail. The type of presentation can also effect a saving in film. Fig. 18 shows a continuous-motion recording of pulses coming in at some frequency and repetition rate which varies from time to time. These pulses might have been recorded by the standard continuous-motion technique in which the film provides the time base. It can be seen that in using this technique as shown in the bottom portion of the figure, the pulses are crowded