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 #:
00047
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. 5. Engineering model of the Converter. dropped to 104 v and shifted to 107° from phase 1 and 131° from phase 3, phase 2 has dropped to 118 v while phase 3 has shifted 4° and increased voltage slightly. As a result, the motor was noisy and the maximum stable power obtainable was reduced from 160 w mechanical to 100 w or 62 \% of normal. This was chiefly due to the changes in phase 1 with some contribution from the reduced voltage in phase 2; the voltage change and phase shift of phase 3 being of little importance. In this connection it was found that unbalance of 10 v between phases, or 5 to 6° departure from the ideal, did not create noticeable noise or power reduction unless these factors combined. Figure 4 is similar to Fig. 3 except that correction for increased load was made, as described, by means of the Variac T3. In Fig. 4A the phase shift and voltage change in the primary of T2 is small, being 2° and 4 volts, respectively. In Fig. 4B the phase shift in the motor windings is negligible (3° maximum) although some voltage unbalance exists due to an increase in voltage of phase 38 July 1952 Journal of the SMPTE Vol.59