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

Page scan 000586 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 #:
000586
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 MEASURING SHOCK 583 One of the secrets of good photography is proper illumination of the object and high-speed motion pictures are no exception. It stands to reason that since the exposure time is so extremely short the intensity of the light source must be great. Special projection lamps are used capable of delivering approximately from 10,000 to 100,000 foot-candles. About three of these spotlights are used and a general camera set up with lights in place is shown in Fig. 5. We must provide proper reference marks if a film is to be of use for measuring displacements. We have found that fine twine of a white Fig. 6— Timing streak on film. material strung across the particular spot to be photographed in a vertical and horizontal manner is quite satisfactory. Special care must be exercised to secure the lines to fastening points which are not affected by the shock. Next a piece of tape of known width, usually 1 inch, is fastened to the object to establish a dimensional scale factor. The salient parts to be recorded are outlined, if possible, and then the cameraman proceeds to set up his camera to find the proper distance for the right field and finally obtains a sharp focus of the picture. Next, the timing signals are worked out. There is always a delay between the release of the hammer and the subsequent shock. If it is possible to obtain an electrical signal at the moment