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

Page scan 000633 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 #:
000633
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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(a) 16mm FILM, 1000 TIMING UNITS PER SECOND ~i FRAME: .30 INCHES Jfmm i TIMING UNIT: i (b) 16 mm FILM, 60 TIMING UNITS PER SECOND FRAME: 30 INCHES I TIMING UNIT: 16.67 ms 8mm FILM, 1000 TIMING UNITS PER SECOND 8mm ™J M FRAME:. 15 INCHES TIMING UNITMms Fig. 1. Standard films with timing marks. based on a simplified reading of values from the film. For evaluation purposes, the length of the film is divided into parts, over which the original film velocity (during film run in the camera) can be considered constant, depending on the acceleration of the film and accuracy desired. Within such a part of film, any time interval and the corresponding number of frames are in constant proportion. This can be designated as the "frame time," i.e., time value of one frame. The number of frames representing a certain operating time is counted either visually (when small) or by means of a mechanical frame counter, the latter being either on the projector or separate. The height of one frame, 0.30 in. for 16-mm film and 0.15 in. for 8-mm film, is used as the unit of length for the film, thus eliminating any length measurements in the direction of film motion by means of a scale. With regard to time, only small time intervals consisting of a few timing units are counted visually. Greater time intervals are calculated by means of the slide rule, using the frame time and the corresponding number of frames. 624 June 1951 Journal of the SMPTE Vol. 56