Society of Motion Picture Engineers : incorporation and by-laws (1927)

Page scan 000128 from Society of Motion Picture Engineers : incorporation and by-laws

Record Details:

Title:
Society of Motion Picture Engineers : incorporation and by-laws
Date:
1927
Publisher:
New York : Society of Motion Picture Engineers
Volume:
Transactions of the Society of Motion Picture Engineers (1927)
Leaf #:
000128
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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118 Transactions of S.M.P.E., July 1927 beam is noticeably whiter than the searchHght beam produced by the same arc. This color difference arises, of course, from the flame light being outside of the true searchlight beam and hence lost for projection purposes. BEAM CHARACTERISTICS 3G" DIA. STUDIO FLOODLIGHTS 150 AMPERE HIGH INTENSITY ARC LUMENS NIDTH APARABOLOID IGlfiOO E5° BPOLYGONAL Z54W0 31 ° BEAM TEST AT 100 FT. RADIUS -lon^ j^ ' — ^ -B r'i / If) \ r< A '/ '^s ^v 1 Q-' >^' y V J / ^ kW^ ,.-' \ \ /; \0u^ i\ 1 \ 1 \ / •^' \ \ ' 10 1 0 V k P 14 12 10 3 G ^ Z 0 Z 4 G 3 10 IZ 14 k DEGREES PROM AXIS OF BEAM 0 Fig. 7 — Beam characteristics of a 150 ampere arc with A — 36 in. dia. paraboloidal mirror ; B — 36 in. dia. 25 section polygonal mirror. Under the same conditions of test the parabolic mirror gave a characteristic distribution as shown by curve A, Fig. 7. The central dark spot is still strongly evident despite the fact that the lamp was lowered several inches below the axis. The ring of high intensity around the edge of the beam is highly characteristic of this type of mirror, and the wider the beam is spread the more pronounced will this maximum become. . ' It may not be out of place to remark that the sectional mirror is, next to the plane mirror, the oldest type known. The Roman fleet