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 #:
000534
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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1948 VARIABLE^AREA RECORDING 519 Hence, An = \ (y — z) sin nz dz. (34) Integrating by parts, An = \ — (y — z) cos nz * + / cos nz d(y z) . (35) nir\_ o JO _| The integrated term disappears since y = z f or the limiting values of 0 and TT as is evident from (31). Also J^ cos ny dy = 0. Hence, on substituting y — ft sin y = z An = —' I cos n (y — ft sin y)dy (36) = \Jn (na) (37) by the Bessel integral. The solution thus becomes y — z = J^ -Jn(np) sin nz. (38) i Substituting from (31) \ 2 \-~» 1 T / n&ir&o \ + ao tan a) -\ — > Jn I — tan a ] n "Y n \ X / sin^ (x + aotan a). (39) 2?r . 2?r — (x + £ sin a) = — A A T Since tan a = ,... (40) From this equation the coefficients of fundamental, second, third, etc., harmonics may be computed for assigned values of r/\ and known values of Jn. Solutions for the bilateral and dulateral cases may be obtained in an analogous manner. DISCUSSION MR. C. R. SKINNER: -The Skinner Company has been manufacturing a unit like that since 1928. There is one slight difference. To get the slit effect, a