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

Page scan 000538 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 #:
000538
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 535 Y should not appreciably overlap the diffraction pattern due to the region a-a as represented by term (c) of (21). The value of y = f4>/a indicates the position of the central maxima of the diffraction pattern due to a-a and represents an upper limit to the half width of a light source of finite size. It is interesting to note in Fig. 13 that a source of half width w =f<l>/a located symmetrically with respect to the optic axis, gives the same contrast for both 0/a = 0.125 X and 0/a = 125A, i.e., C = 0.4, or 2.5 times as much light at maximum intensity as (a) (b) (c) (d) Fig. 9 — Diffraction patterns for optical discontinuities of magnitude 20. at minimum background intensity when the knife-edge extends from — oo to the optic axis. If a < < A or A /a » I, as is usually the case for shock waves, the terms (b) and (c) of (21) can be neglected. The remaining term (a) indicates how the diffraction pattern varies for an optical discontinuity of magnitude10 20. Equation (21) then becomes G(y) = 2 sin i ^ cos ^20 ^) (22) G(y} 0 at 20-^=,. (23)