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 #:
000528
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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1950 LARGE-SCREEN TV PROJECTION 523 The regulation of the rectifier is between 65 kv on open circuit to 55 kv on 10-ma load, which is not sufficient. Originally we had stabilization on the primary of the transformer, but this does not eliminate ripple in the pack or take up rapid changes ; a new circuit has therefore been evolved, shown in Fig. 7, which gives a control to 1%. This is built around the development of a special high-voltage stabilizing triode and a high-voltage limiting diode. The operating of these tubes is self-explanatory, but it is still essential to place the diode as close to the projection tube as possible in order to reduce the energy MAIN EH.T POWER PACK 65 KV OFF LOAD 55 KV IO MA. CONTINUOUS Fig. 7. E.H.T. supply circuit. involved in the discharge of the cable capacity between the diode and the tube, within the tube. Special high-voltage transformers of small dimensions have been evolved for this circuit. Their design has been made possible by the use of polythene-insulated wire and the application of the new technique of welding polythene screens over the windings. Conclusion To summarize, this paper has briefly described some of the many problems which have been attacked in the development of our