Journal of the Society of Motion Picture Engineers (1930-1949)

Page scan 000327 from Journal of the Society of Motion Picture Engineers

Record Details:

Title:
Journal of the Society of Motion Picture Engineers
Date:
1930-1949
Publisher:
New York, N.Y. : The Society
Volume:
Journal of the Society of Motion Picture Engineers
Leaf #:
000327
Language:
English
Collection:
Technical Journals
Format:
Periodicals
Contributor:
Prelinger Library
Sponsor:
MSN
Coordinator:
Media History Digital Library
Description:
The Journal of the Society of Motion Picture Engineers (SMPE)Êdocuments the technological progress of the film industry, highlighting technical developments in production and exhibition. Of special interest are articles about special effects, theater practices, lighting, and the introduction of the 16mm format. Initially titled "Transactions of the Journal of the Society of Motion Picture Engineers."Digitized by the Prelinger Library and the Library of Congress Motion Picture, Broadcasting and Recorded Sound Division.
Date Added:
July 19, 2022
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304 KUNZ, GOLDBERG, AND IVES Vol 42, No. 5 rheostat, the 100-w spotlight lamp which has a large spherical enve- lope was retained. All the lenses are mounted in a single tube with the objective lens Lz located as near to the shutter as possible on the side toward the lamp. The focal length of the condenser lens combination L\L^ is such as to form an image of the filament as large as possible in the ob- jective lens, the diameter of which is limited by the size of the tunnel opening. The size of the filament and the diameter of the lamp bulb REFLECTING SURFACE OF MIRROR. HAS A RADIUS OF 2^" AND A DIAMETER OF 2-jj" LAMP IS AT8-J MONOPLANE \\ FILAMENT PROJECTION LAMP FIG. 5. are controlling factors in the present case. The focal length of the objective L$ is determined by the length of the tunnel and the posi- tion of the condenser LiL*. The diameter of LiL 2 is such as to provide a sufficiently large image at the printing aperture. An increase of illumination by a factor of at least 8 times is ob- tained. Greater intensity could be obtained with a tubular lamp of smaller envelope diameter by making the proper adjustment of the lens constants. The use of a spherical mirror to form an interlacing filament image among the filament coils would increase the efficiency of this system,