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

Page scan 000199 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 #:
000199
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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measurement. Aging or changing of the lamp had no influence on the readings. The different density ranges and calibrations are selected by five push buttons plainly marked in front of the meter case. The film strip is held in a step-calibrated carriage, allowing easy selection of different tablet steps. After a 15-min warm-up period, recalibration is seldom necessary. The maximum range of the instrument is sufficient for all measurements encountered in the motion picture industry. Selection of the proper filter is simple and sure. All readings taken are diffuse readings and no change of location of the photoelectric cell is necessary. The absolute accuracy of reading, compared to a sphere-type and visual type instrument, is sufficiently close for all purposes for which the instrument may be used. A 20-db signal-to-noise ratio on its highest reading, at a density of 4.2, guarantees accuracy over the complete range. The bandwidth of each of the three color filters is sufficiently narrow, and the suppression of all unwanted radiation sufficient to give an insertion loss of more than the equivalent of a density of 7.0 to white light when any two of the three filters are placed into the light beam at the same time. The instrument is calibrated electrically. The accuracy thus obtained is only a function of how much care has been taken in doing it. Several of these instruments are now in commercial service and have given consistent results. 190 September 1952 Journal of the SMPTE Vol. 59