Society of Motion Picture Engineers : incorporation and by-laws (1919)

Page scan 000226 from Society of Motion Picture Engineers : incorporation and by-laws

Record Details:

Title:
Society of Motion Picture Engineers : incorporation and by-laws
Date:
1919
Publisher:
Washington D.C. : Society of Motion Picture Engineers
Volume:
Transactions of the Society of Motion Picture Engineers (1919)
Leaf #:
000226
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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lend additional support to the conclusions reached in the experimental work to be described in the following pages. In order to make an actual determination of the maximum general illumination permissible, an experimental lighting system was installed in the Projection Room in the Research Laboratory. In designing this system an attempt was made to obtain the maximum average illumination on the table plane (horizontal surface 30 inches above the floor) with a minimum of illumination on the projection screen, and further to distribute the light so that no area either of wall, ceiling, or lighting fixture should be sufficiently bright to .SIDE ELEVATION StaI I 2 1 3 14 is 6 ' 1 ^^-^ A . T ^ 7' 4= i — r ^ r \r + —p^ •lACK f ~ \^ INDIRECT c/-Bcn A / PniURE : == ^ — _^ ' ~~~~ BLACK j A, B C D e| . r niOJECTWN BOOTH 1 r PLAN BLACK VELVET Fig. 3. cause glare or appreciable increase in the adaptation level of the observer. In Fig. 2 is shown a side elevation of the room with the locations of the various elements of interest in this problem and the dimensions of importance. In Fig. 3 is given a plan view and in Fig. 4 an end elevation showing screen with its surrounding frame of black velvet. The ceiling of this room is painted white, while the walls are a medium tone of bufif. The projection screen is of the metallic type (Gaumont), having a high reflecting power for points on and near the axis, but falling off rapidly for angles of greater than 15° from the axis. 86