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 #:
000345
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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Fig. 1. A-C Arc Slide Projector. The magnification of the carbon crater on the slide aperture is sufficient to cover a 2 in. by 2 in. slide. When 3j in. by 4 in. slides are projected, a negative lens is placed in the beam of light between the lamp and planoconvex lens to increase the magnification sufficiently to cover the larger aperture. The power transformer which isolates the a-c line potential from the lamphouse draws 10 amp from any 115-v convenience outlet and delivers 45 amp at 21 v to the arc. The eight-point rotary tap switch and indicating meter provide a convenient means of coi pensating for commercial variations the a-c line voltage. The indicating meter, in reality a voltmeter with a suppressed zero, is connected across a portion of the transformer primary winding. When the hand of the indicating meter scales in the green zone, the volts per turn of the transformer primary are at the right value to deliver the correct amount of power to the arc. The tap switch is simply turned until the primary volts 336 October 1952 Journal of the SMPTE Vol.59