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

Page scan 000570 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 #:
000570
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 567 In some cases it is of advantage to run the sweep along the direction of film motion. This enables expansion or contraction of portions of the phenomenon. Fig. 21 (a) shows such a vibrational pattern in which the detail in the initial shock wave is lost due to the high frequency. By using a fast single sweep which runs only during the start of the phenomenon, in addition to the film motion, we obtain the pattern of Fig. 21(b) showing the requisite high-frequency components. Fig. 20 — Incandescence of a lamp showing steady and transient states. Since the writing rate is higher during the sweep interval, it is also desirable to provide a grid intensifying pulse during this time to avoid underexposure. CATHODE-RAY-TUBE SCREENS Careful consideration should be given to the type of cathode-raytube screen used for photography. If a particular oscillographic equipment is to be used only for photography, the screen type should probably be a short persistence, blue, highly actinic screen such as the Type P5 or Pll. If continuous-motion recordings are to be made at very high speeds of over, roughly, 100 feet per second, then the P5 or calcium tungstate screen must be used to avoid blurring.