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 #:
000646
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 WHEELS FOR PROJECTORS 629 oscillation; the stroke gradually shortens as the relative motion becomes elliptical, the minor axis increasing and the major axis, which lies along the 45 degree line, gradually decreasing till the relative motion becomes circular; the circle elongates into an ellipse and the ellipse flattens into a straight line at right angles to the "in phase" line; the motion again becomes elliptical (this time, however, the center of the lens blank travels in the reverse direction around the ellipse) and passes, in the reverse order, through the above mentioned forms back to the original "in phase" straight line. FIG. 4. Lens setter, right side view. It will be evident from the foregoing that the tendency toward uneven grinding and polishing is entirely eliminated in this machine and therefore the lap and lens surface will remain true to curve during the grinding and polishing operations. As a matter of fact the lens surface is actually generated about the center of curvature of the lap and therefore the only possible change in curvature that can occur is the very slight change caused by the even wearing away of the lap