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 #:
000541
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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538 SHAFER November given knife-edge position y, between the limits — w to +w of the light source then gives I(z) for a given light-source size, 2w, and given knifeedge position, 2/1. Fig. 13 shows a maximum contrast at w = 6.25 X 10 ~2 mm. This is the half width R of the Airy disk of the system, which is the distance from the optic axis to the first value of y for which G(y) = 0, for a free 10,000. 1,000. -10 •« -G -4 10 -2 0 2 4 6 Z-cm Fig. 12— Effect of source size on the lightintensity distribution in the image of a disturbance of Fig. 5. A = 10, a = 1, </> = 0.125 X,/ = 250 cm. The knife-edge cutoff position is at the optic axis. aperture in Fig. 9 (a) . This distance is given by the / ratio of the system and the wavelength of light used R g X {• (28) The abscissas of Figs. 12 and 13 can be nondimensionalized by expressing w or 2/1 in terms of R. The ideal light-source size for maximum contrast is 2w = 2R. This value for a practical schlieren system is much too small to be realized.