Transactions of the Society of Motion Picture Engineers (1925)

Record Details:

Title:
Transactions of the Society of Motion Picture Engineers
Date:
1925
Publisher:
New York : Society of Motion Picture Engineers
Volume:
Transactions of the Society of Motion Picture Engineers (1925)
Leaf #:
000473
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:
November 10, 2022
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High Intensity Arc — Ben ford 75 The crater gas has by far the highest briniancy. The flame is next, being composed in part of the crater gas that escapes over the upper rim of the crater, and the arc stream is lowest in intensity, being perhaps identical with the arc stream from pure carbon electrodes. A ver}^ necessary condition is the formation of a deep and symmetrical crater, and in order to secure this the positive is rotated at about sixteen revolutions per minute. The original lamps also Fig. 5. — A motor driven studio mechanism for both floodhghting and projection rotated the negative, but this was found to be an unnecessary refinement and is no longer used. Mechanism The proper functioning of the high intensity arc calls for a very strict adjustment of the electrodes with respect to one another, and when used as the light source in a searchlight the crater must be held