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

Page scan 000323 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 #:
000323
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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thus permitting the use of lower amperage in the arc of the projection machine. On the other hand, a screen of the specular type installed in a room where the length is relatively small as compared with the width will not be found satisfactory. Since the screen in this case may be viewed by a part of the audience at a relatively large .a i Diagram of Goniophotometer. angle, it will be necessary to use a high arc current in order to make the picture of satisfactory brightness for these observers. This will result in an unnecessarily high brightness on the axis of projection and may result in excessive visual fatigue owing to glare. It should be pointed out also in case the throw is somewhat short that a highly Fig. 2 — Photograph of Goniophotometer. specular screen may appear of unequal brightness when viewed from a single point of observation, since the angle of incidence varies from point to point on the screen, and that for an observer relatively near to the screen the angle of observation is not constant for all parts of the picture. 61