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 #:
000650
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 633 of the image of a target formed in the plane of the cross hairs by the lens sector, and an index ring concentric with the lens wheel and arranged to advance the lens wheel by equal increments to produce exact angular displacement of successive lens sector centers. The offset distance from the axis of the telescope tube to the axis of the lens wheel is equal to the radius of the circle on which the optical centers of the lens sectors are to be located. The index ring is of large diameter and must be accurately made. The variation in chords be FIG. 7. Lens setter, front view showing telescope tube rotated 90 degrees from position shown in Fig. 6. tween centers of index holes should not exceed 0.0001 in. The rotating telescope tube carrying the offset bracket on which the lens wheel is mounted, is provided with ball bearings and is driven, through a reduction gear, by a small motor. An adjustable counter weight is provided opposite the offset bracket to balance the weight of the lens wheel and index ring, thus permitting uniform rotation of the telescope tube while the motor is operating. The eye piece is mounted