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 #:
000430
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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April, 1930] RADIATION CHARACTERISTICS 413 resistance of the top coils. If the line voltage is reduced, the lamp current will gradually fall to 19 amperes at 13 volts, and at about this point the arc will break and then reform with the ends of the arc making contact with both the electrodes and the top coils of the filament. Dotted curve's, E and F, represent the relations existing FIG. 10. General Electric Sunlamp, Type S-l. when the arc is breaking and reforming. A further reduction of line voltage will give the stable characteristic, G, but this is not a desirable condition on account of the arc overheating the coils where it makes contact. A further reduction of current to below 10 amperes will cause permanent breaking of the arc and equilibrium will be attained at some point on the filament curve, A .