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 #:
000578
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 575 of deposit either by the use of higher voltages or higher speed lenses. In general, the improvement can be obtained more readily from the use of a higher speed lens than by increasing the accelerating voltage or drive of the oscillograph. AMPLITUDE CALIBRATION By the use of suitable calibration methods, an improvement in the appearance and the accuracy of oscillograms may be readily effected. This calibration may merely take the form of a graduated scale, as li Fig. 27 — Matrix used for calibration. seen in Fig. 26, which makes the assumption that the deflection across the face of the cathode-ray tube is linear. The use of such a scale greatly enhances the appearance of such an oscillogram, and gives one the illusion that he is making an accurate recording. In order to obtain very accurate measurements from the face of the cathode-ray tube, the trace preferably should be self-calibrated. No convenient circuits have yet been described for this purpose. A suitable calibration which takes into account the nonlinearity in the cathode-ray tube and amplifiers is the use of a double-exposure technique in which a matrix of calibrating spots is used to display the