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

Page scan 00083 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 #:
00083
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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Conclusions From the foregoing experiments as illustrated by diagrams, measurements and photographs it is apparent when using the incandescent lamp as an illuminant that: First, a relatively large diameter objective is to be preferred. Second, a short separation between the condenser and aperture plate, suited of course to the diameter and focus of the objective, is advantageous. Third, the great advantage of the corrugated condenser is that an even screen illumination can be secured with a shorter separation between the condenser and the aperture than is possible with the plano-convex condenser system, thereby securing the greatest possible brightness of the picture. Fourth, to get the greatest screen illumination when using the incandescent lamp the combination of all of the optical elements working at their greatest efficiency is required, including good quality reflector, proper adjustment, large diameter objective, and corrugated condenser used at the separation of 63^'' from the aperture plate for which it was designed. 75