Transactions of the Society of Motion Picture Engineers (1916)

Record Details:

Title:
Transactions of the Society of Motion Picture Engineers
Date:
1916
Publisher:
Washington D.C. : Society of Motion Picture Engineers
Volume:
Society of Motion Picture Engineers : incorporation and by-laws (1916)
Leaf #:
00060
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:
December 28, 2023
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operate at these higher current densities, that special small diameter metal coated negative carbons be used, the reason being as alreadymentioned that such combinations can be operated at high current densities, with short and steady arcs free from noise, whereas for the same current density and the use of ordinary negatives, the arcs would be unsteady. 8. Since the light from the direct current arc is emitted from the cratef of the positive carbon, it is desirable that the carbon be tilted at such an angle as to point the crater directly at the lens, and still prevent the lower carbon from cutting off the light. An angle of about 25 degrees has become standard for this service. With an alternating current arc the light is given by both carbons, which means that it is desirable to use the carbons more nearly vertical. A slight angle is, however, necessary in order to make draft conditions correct. 9. With Alternating current the carrying capacity is limited by the ability of the carbon to carry the current, whereas on direct current, it is limited by the ability of the crater to stand up under high current densities; that is, the 5/8" carbon can carry 60 amperes alternating current without undue heating, but on direct current 50 amperes would be the limit, since a higher current value would tend to break down the crater formation with subsequent unsteady operation.