Society of Motion Picture Engineers : incorporation and by-laws (1927)

Page scan 000124 from Society of Motion Picture Engineers : incorporation and by-laws

Record Details:

Title:
Society of Motion Picture Engineers : incorporation and by-laws
Date:
1927
Publisher:
New York : Society of Motion Picture Engineers
Volume:
Transactions of the Society of Motion Picture Engineers (1927)
Leaf #:
000124
Language:
English
Subjects:
motion pictures, Cinematography -- Periodicals
Collection:
Technical Journals
Format:
Periodicals
Contributor:
Library of Congress, MBRS, Moving Image Section
Sponsor:
Library of Congress, Motion Picture, Broadcasting and Recorded Sound Division
Coordinator:
Media History Digital Library
Description:
Preceeded by an unnumbered issue published in 1916 called: Incorporation and by-laws
Date Added:
September 12, 2024
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114 Transactions of S.M.P.E., July 1927 are. The optical relation of the image back of each section to the outline of that section carries this foreshortening still further and the individual beam becomes more nearly equal in the two diameters corresponding to the two centerlines of the section of mirror. As MIHROf^ DESIGN ^5 5ECTI0N 3GIN. POLVaONAL MIRROR FOCAL LENGTH lZ.d5' ISO AMR HIQH INTENSITY ARC Fig. 4 — A typical form taken by a paraboloidal shell "when lined with polygons designed to give individual beams of uniform sectional area. an illustration, the average width of a mirror in the outer zone is 7.81 in. and the length is 8.50 in., but the beam from this mirror is almost square in section, and each of these square beams is rotated 30 deg. from the orientation of the beam from an adjacent mirror in the same zone. As a result of the way in which the corners of the beams are spaced around the edge of the combined beam they are almost wholly lost to view, and the beam appears circular in outline with a series of 48 faint scallops equally spaced around the edge. The