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 #:
000682
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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June, 1930] CURVED GATES IN OPTICAL PRINTERS 665 bola, or ellipse, and hence a value of r was sought which would make the gate a circle, that is, make the coefficients of x2 and y2 in (2) equal. This value is: u0(u0 U0 V0 •(4) 2(u0 /) 2 This value not only makes the image curve a circle, but a circle of FIG. 2. Special solution for a 2 : 1 reduction printer. exactly the same size as the object circle. For any magnification we may express r as a function of / and m (magnification) as follows: , r -•/,/(» -i) (5) Thus for a print with a 2:1 reduction ratio (see Fig. 2) r = V2/(3/2) = 3/4/ From (5) we see, however, that it is impossible to make use of this special solution for printing at one-to-one magnification, for in that case m = 1 and the radius becomes zero. —I — AV FIG. 3. Illustration of method of computing best circle for image gate.