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 #:
00039
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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32 D. B. JOY AND E. R. GEIB [J. S. M. P. E. greater detail in a later paragraph. The limits of arc voltage, as ordinarily measured at the incoming leads, will vary slightly depend- ing upon the length of spindle of the carbons, the lengths of the car- bons in the holders, and the resistance of the holders themselves FIG. 6. 8-mm. a-c. high-intensity carbons: 80 amperes, 28 to 29 volts; (4) long arc length, good operating conditions; (B) long arc length, poor operating conditions. At 75 amperes the arc lengths that will give good burning character- istics with the 8-mm. carbons are essentially the same as those for 80 amperes, and the arc voltage is approximately one volt lower. The 7-mm. high-intensity a-c. carbons are rated from 60 to 65 am- peres. The corresponding conditions for good operation are an arc FIG. 7. 8-mm. a-c. high-intensity carbons: 80 amperes, 26 volts; medium arc length, arc dis- turbed by external forces. gap of 0.21 inch (5.3 mm.) to 0.31 inch (7.9 mm.), and an arc voltage of approximately 23 to 26 volts. The action of the high-intensity a-c. arc under various conditions has a direct bearing on the limitations of the mechanism for feeding