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 #:
000520
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 515 3. On the center of this plate is a selenium photocell which measures the average brightness of the picture and the reading of which is indicated back on the control equipment. This cell is used to indicate the average beam current, as all tubes are calibrated in the laboratory and marked with the reading of the photocell current corresponding to 1ma beam current of the tube. 4. Is the face of the projection tube. This is an optically polished hard glass disc, the radius of which is approximately half the radius of the mirror. This plate carries the phosphor which is bombarded by the electron .beam on one side, and to restrict the temperature rise of Fig. 3. Assembly of cathode-ray tube and corrector plate. the phosphor, air at room temperature is blown across the face from an air nozzle. In the future it is planned to treat the outer face of the tube with an antireflecting coating. 5. Is the air nozzle, the design of which is quite critical to give uniform cooling over the whole face without noise. These two requirements go against each other, and a compromise has been found which is reasonably successful on normal television programs. 6. Is the anode connection to the tube made through an internal wire connection welded to a large platinum disk pressed into the inner surface of the glass envelope. The size of the disk is sufficient to ensure a low resistance contact to the graphite internal coating of the