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 #:
000543
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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540 SHAFER November background and the image of any model in the tunnel. It appears from Fig. 14 that the knife-edge should be placed with its cutoff edge just at the optic axis for most general use. However, in specific cases it will be advisable to use other positions. ASTIGMATISM In considering the focal length of the optics to use in a schlieren system, the problem of astigmatism will enter as an important factor. 50URCE WIDTH IZ5mm SOURCE WIDTH IZ5x |(fmm -If c -I y,-mm 10" 10 Fig. 14 — Variation of contrast and density of the image of Fig. 5 with a light source of finite size for various cutoff positions of the knife-edge. A = 10, a = 0.001, 0 = 0.125 A, / = 250 cm. It is the general practice to use mirrors rather than lensefe in large schlieren systems since the former are inherently achromatic and less expensive. The use of mirrors presents the problem of introducing light into the system. Two arrangements are generally used : one a skewed or Z system; the other a Newtonian system. In the Z system, which is the more common, there are possibilities of coma and astigmatism. Coma can be eliminated by making a = ft. However, the astigmatism is most difficult to correct for. This abberation is of importance when using different knife-edge orientations since the axial knife-edge position for horizontal and vertical cutoff