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 #:
000232
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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Full angle 2u Half angle u sin u sin iu at source at source 20° 10° 0.174 0.03 K 20° 0.342 0.12 60° 80° 100° 120° '0° 50° 60° 0.500 0.648 0.766 0.866 0.25 0.42 0.59 0.75 If we increase the angle u in our example from 10° to 20°, 30°, 40°, we shall have a relative illumination on the screen proportionate to 0.12, 0.25, 0.42 against 0.03, or taking the latter as unit, an increase of illumination of 4 times, 8.3 times, 14 times over the original case. This consideration does not take into account the loss by absorption and reflection in the passing through the condenser of the light. Even though by use of the condenser we utilize a greater amount of -^P5T R^D>K5i°^■'' )t^diation utilized RADIATION NOT UTILIZED FOR PROOECTION i Fig. 2 By interposition of an optically perfect condenser C, the illumination on the screen can be increased, because a greater solid angle of the radiation from the source S is utilized for producing a picture on the screen of the same size as shown in Fig. i. The upper figure shows how by placing a spherical mirror with its center curvature in coincidence with the light source, the quantity of light reaching the lens can, at least theoretically, be doubled. 46