Journal of the Society of Motion Picture Engineers (1930-1949)

Page scan 000540 from Journal of the Society of Motion Picture Engineers

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 #:
000540
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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1949 SCHLIEREN PHOTOGRAPHY 537 when G(y) = 0; i.e., the knife-edge should be placed at a position where G(y) = 0. More specifically it should be placed in such a position that only the positive central maximum and all higher spectral orders on one side of this maxima are not obstructed. The actual position of the knife edge can be computed from (23) yi= _. 1 X i (TT 0). (27) The larger/ or smaller A the less sensitive will be the actual knife-edge adjustment; however, it may be recalled that for a given disturbance -14 -12 -IO -S -G -4 -2 0 2 4 10 12 14 Fig. 1 1 — Graph of I(z) as a function of z for several knife-edge positions. A = 10, a = 1, 4> = 0.125 \, f = 250 cm. size a-a, 7(0) max is a function of A/a so that if A is decreased, the contrast will decrease although this will be compensated for by less critical knife-edge adjustment. Similarly, increasing / will require less critical knife-edge adjustment at the sacrifice of light-gathering power. FINITE SOURCE The effect of source of finite size can be determined by evaluating (19) for a series of noncoherent point sources located at different distances w from the optic axis. The values of I(z) for each source position w are then plotted as a function of w for the several stations z in the image plane. A mechanical integration of these plots about a