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 #:
00071
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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68 BERKLEY AND FELDT July technique which was prescribed for shutters is now used as an American Standard for testing photographic flash lamps.10 It is also possible to make recordings of the characteristics of a combustion type of flash lamp with a high-speed recording galvanometer. This equipment, however, fails when we attempt to measure the new gaseousdischarge microflash lamps, whose duration of light output may be of the order of a few microseconds; only a cathode-ray oscillograph can Fig. 1 — (c) Same shutter properly adjusted for uniform slit travel. measure times of such order conveniently. Fig. 2 compares relative duration of shutter and flash. The circuit for studying these phenomena can be a very simple one. The gas tubes usually have an accessory ignition coil operated from a trigger circuit, consisting of a small, cold-cathode, gas tube. The same pulse which fires the cold-cathode tube can be used to start the sweep of the oscillograph. There is sufficient delay in the initiating tube so that the sweep starts before the ionization in the flash tube becomes appreciable. Fig. 3 showrs dual-beam oscillograms of such a photoflash tube in which a much higher shutter speed has been used, displaying the opening of the