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 #:
000642
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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June, 1930] LENS FOR PROJECTORS 625 curacy of curvature of the lap surface. But if this expert lens maker continues to grind surface after surface on successive lens blanks with the same lap, it will wear irregularly, lose its original contour and soon become incapable of grinding to the exact curvature of the first lens surfaced. The more skilled the lens maker, the more nearly the FIG. 2. Improved lens grinding and polishing machine. lap will conform to its original shape as the grinding progresses but even the expert cannot prevent a gradual changing in curvature, which means a changed focal length or a departure from the true sphere or both, in the finished lens. To restore the lap to its original curvature requires special grinding with a matched lap of opposite