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

Page scan 00023 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 #:
00023
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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line c''""reiit Aurperes. Fig 6 — Relation of Ciirrent to Photographic Effect on no Volt Lines with Enclosed Carbon Arc versus Single and Twin Flame Arcs ditions. From a series of tests of a direct current flame arc lamp, I have deduced the following approximate equation for photographic efficiency as regards effect on solio paper for a single direct current flame arc. C is current and V is arc voltage within moderate limits (40 to 80). Photographic efficiency = KC (V-23) On alternating current efficiency increases as C^"^ The flame arc also increases in candlepower more rapidly than the current, but this phase of the matter does not need to be enlarged upon here. The color of Hght increases toward the short wave lengths faster than the long wave lengths with increase in current. With increase in current the blue light increases more than the green and the green more than the red. 3-E. AMOUNT OF LIGHT IN REL=\TION TO ARC VOLTAGE We will very briefly consider the relation of photographic effect on soHo paper to arc voltage (see Fig. 4) keeping the current constant. The following results were obtained by using a 330 volt direct current circuit with the trim of a 10 mm x 305 mm lower flame positive and a 123/^x305 mm upper x 12'') cored enclosed arc standard negative upper. The data shows the great advantage of using two flame arcs in series on no volts. The working equa 15