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 #:
000413
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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410 AYLING October The standard 115-volt transformer is designed with a manual tapchanging system to allow for any commercial voltage variations between 95 to 135 volts. The conveniently located coarse tap adjustment has three leads mounted on a terminal block. The line-feed wire is connected to the terminal having the voltage marking most nearly equal to the local voltage condition. If a finer adjustment is desired, an eight-position dial switch efficiently serves the purpose. A quick twist of the switch in the desired direction will instantly change the power consumption without extinguishing the arc. STEADYING HANDLE AC LINE CORD POWER SUPPLY _NAME PLATE LINE VOLTAGE S FREQUENCY PLATE Fig. 2 — Base and power supply. An indicating voltmeter eliminates guesswork in ad justing the transformer for proper arc voltage. The meter dial is equipped with a green zone. When the needle is in the center of the green zone, the correct power is being supplied to the arc, and the correct gap will be maintained. The top section of the base, called the yoke-and-cradle assembly, is connected to an adjustable, tubular column. This allows the optical centerline of the spotlight to vary in height from 46 to 58 inches. Practically any working condition can be mastered within this range. A five-wire braided electrical cord, connected to the transformer is neatly concealed by running through the tubular column to the yoke terminal box. The three control wires are connected to a polarized