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 #:
000539
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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524 BROWDER November in this application. A ten-power apochromatic lens is used because of the completeness of the correction for spherical aberration with this type of lens in the neighborhood of 4200 angstroms at which the film is most sensitive. The lens system is mounted within the structure of the light valve which enables the light valve to be removed from the modulator and reinstalled or replaced without the necessity for refocusing or readjustment of sound-track position. A planeglass window is employed at the light-source end of the light valve RIBBON CARRIAGE •/ * MAGNET Fig. 2 — Cross-section view of area light valve. so that, it, the objective lens, the pole pieces, and the magnet structure provide complete sealing of the ribbon gap against the entrance of moisture or magnetic particles. Fig. 3 shows the completely assembled variable-area light valve. The RA-1247, or push-pull, light valve employs three ribbons which are directly imaged onto the film by means of the objective lens. The RA-1405 dulateral light valve employs an image doubler, the functioning of which is depicted schematically in Fig. 4. The light flux emerging from the ribbon aperture is divided by a biplate image doubler which consists of two plane-parallel glass slabs inclined in