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 #:
000564
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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1949 CATHODE-RAY OSCILLOGRAPHY 561 periods from one hour to several weeks. One solution to this problem is the use of orthochromatic recording film comparatively insensitive to the more or less orange light from the cathode-ray-tube cathode, or, the use of dark blue filters and Pll photographic screens whose peak emission is far removed from the emission spectrum of the incandescent filament. Fig. 12 shows this effect. Another source of stray illumination on the cathode-ray-tube face is the stray emission of electrons from various portions of the tube. These stray electrons may result from secondary emission from sharp Fig. 13 — Effect of electron reflection from deflection plate. portions of the gun structure, from impurities in the cathode-ray-tube walls, from high accelerating voltage, or from secondary electrons reflected from the deflection plates. Fig. 13 shows such secondary electrons caused by reflection from the deflection plates of a cathode-ray tube. Fig. 14 shows stray electrons caused by high field emission and secondary emission from the rings of a Type 5RP tube.3 Secondary emission caused by reflection from deflection plates usually can be minimized by the proper choice of the position of the cathode-raytube image, while stray emission caused by high field intensities may be minimized by so changing the acceleratingvoltage distribution between second anode and intensifier as to reduce, so far as possible,