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

Page scan 000253 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 #:
000253
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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Fig. 17. brilliancy, such as an arc crater, the value of condenser efficiency in actual projection can be as high as those given in Fig. 9, but from Figs. 22 to 24, it is evident that when using the 900-watt motionpicture lamp, the illumination that can be obtained with a uniform screen is less than the maximum illumination represented by the tops of these curves. Fig. 25 shows the reductions with piano convex and the two prismatic condensers for 2^-inch and 1^-inch objectives. Fig. 25 Piano Prismatic Prismatic Convex No. 2 No. 3 Condenser Objective 2^" U4" 2^" 1^" 2^^" U/^" Max. Illumination 59 .37 .56 .35 .61 .38 Max. Uniform Illumination .28 .30 .45 .11 .58 .38 These figures show the great gain in uniform illumination, with an un-uniform source, made possible by the use of a condenser, such as the prismatic, which does not give a true image. The very low value with prismatic No. 2, when used with a small objective, is 113