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 #:
000153
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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150 BROWDER August PRINCIPLE OF DIRECT-POSITIVE RECORDING For recording direct positive, the aperture between the light-valve ribbons must be projected on the film as a dark area so that it will develop out to clear film. The aperture image must, of course, be bounded by an exposed area which will develop out black on the film. Thus as the ribbon aperture is made smaller in response to noisereduction bias, the percentage of clear area in the developed track be Fig. 1 — Basic optical system for direct-positive recording. comes less and the ground noise in the reproduced film is correspondingly reduced. In principle, this reversal of clear and exposed area from the situation obtained with the standard negative recording system is accomplished as follows : As shown in Fig. 1, the light valve is equipped with a high-quality apochromatic objective lens. Light from the recording lamp is directed off the inclined slit mirror into this objective lens, the working distances being such that an image of the lamp filament is formed at the plane of the light-valve ribbons. As in previous light valves, the width of the ribbon is considerably larger than the thickness. This