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 #:
000474
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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76 Transactions of S.M.P.E., March 1926 A searchlight lamp therefore has the accurately at the focal point following functions : 1. Rotation of positive at a constant rate 2. Feeding of positive to keep crater at focal point 3. Feeding of negative to maintain constant current 4. Maintenance of electrodes in accurate alignment 5. Protection of both electrodes from oxidation by the air Fig. 6. — A full automatic lamp for searchlight service. The mechanism to carry out these five features is much more elaborate than is requu-ed for the plain carbon arc and various lamps that are full automatic, semi-automatic, and mechanical feed, and manual operation has been developed for different services, but it will be appreciated that the high intensity|_mechanism in its simplest form" is more elaborate than the low intensitj^ lamp. Item No. .5