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

Page scan 000189 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 #:
000189
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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D Fig. 1. Explosion of argon flash lamp. A. Lamp with watch glass 0.5 cm ahead of conical pentolite charge. "Primacord" initiator and argon gas line are at rear. B. Frontal lamp flash about 0.5 jtsec after attaining maximum intensity. C. Condition about 3 /zsec after maximum flash. D. Condition about 7 jusec after maximum flash. phototube (S4 cathode) which had a 1000-ohm load resistor and a plate supply of 2000 v. The high plate voltage was necessary to assure that current and light were proportional at the large values of current. The time constant of the output circuit was estimated to be less than 0.1 j*sec. Calibration of light deflection was made by the use of a General Radio Strobolume which produces about 10 million peak beam candlepower. The explosive flashlamp (Fig. 1A), whose performance is reported in this paper, consisted of a 2-oz conical, cast pentolite (50-50 PETN and TNT) charge within a 2.5-in. diameter glass tube containing argon. The front of the conical charge (contained in a glass funnel) was curved to conform with the curvature of the watch glass sealed over the front of the lamp. The desired 0.5-, 1 or 2-cm spacing for argon between the explosive charge and the watch glass was fixed by using a spacer made from a thin gelatin capsule. The pentolite charge was initiated at the rear apex of the cone by means of the "Primacord" detonating 180 September 1952 Journal of the SMPTE Vol. 59