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

Page scan 000122 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 #:
000122
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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112 Transactions of 8.M.P.E., July 1927 any refocusing of the lamp either towards or away from the mirror leads to a loss of beam flux, and the wider the beam is made the more serious does this loss become. The distribution of light in the initially divergent beam is very bad. See the two left hand sketches of Fig. 3. A bright ring of high SPECIAL TEST 150 AMPERE HIQH INTENSITY STUDIO LIQHT Z4 DIAMETER MIRROR OF 14.75" FOCAL LENGTH UIIOTH OF BEAM AT VARIOUS FOCAL ADJUSTMENTS OF ARC t: S/2 0 1 y^ -^PiC lHTZO^ ' \ f t^ \ n \ ^ \J >4^ ') ^ kJ^X u % \ BLACK / \ / \ \ / \ / \o / \ / V y F / 12 13 14 IS 1(3 11 IS DISTANCE FROM BACK OF MIRROR-INCHES Fig. 3 — A photometric exploration for beam outline and width when using a paraboloid and a high intensity are adjusted along the optical axis. intensity encircles the beam, and inside this the intensities fall off to low values. The shadow of the lamp mechanism is not so sharply outlined as before, but it still must be moved from the center or otherwise avoided. The Polygonal Mirror. , During the last few years a considerable amount of attention has been given to the theory and performance of a type of mirror known as the sectional or polygonal mirror. This mirror is made of a metal