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 #:
000151
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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of projection as shown at a Fig. i. However, as the condenser picks up hght from angles up to 40° there are certain portions of the condenser which receive light only from the front rows of coils, the rear coil sections being hidden behind the front row. A condition of this kind necessitates a somewhat larger amount of energy supplied to the coil for a given screen illumination. This increase in the power necessary is considered of secondary importance, the primary requisite being to get as much illumination as possible on the screen. The two rows of filament are placed as close together as practicable in order that all sections of the light source may be as near as possible to the focal point. Lamps of smaller wattage can have the filament arranged in a single row or plane as shown at b and c. a be Fig. I The useful area of light source varies with different condensing systems and different projection lenses. Under a given set of conditions, the useful projected area of filament can be determined by testing back from the screen by means of a lamp. A lighted lamp is placed at each corner of the screen after the objective lens has been carefully focussed and the condensers adjusted so as to give the best illumination on the screen. The light source is then removed from behind the condenser and a test plate placed in the position of the filament. The 37