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

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 #:
000351
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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334 N. T. GORDON [J. S. M. P. E. ible spectrum by the visibility curve. The proportion of effective visible light to total radiation is thus still further reduced. An incandescent tungsten filament has an advantage over a black body due to its selective radiation, and affords a more efficient source of visible light, but the proportion of energy radiated as heat to that radiated as light is still large. The proportions of total radiant energy emitted in the visible spectrum by tungsten lamps are shown in Table I taken from calculations published by Holladay.2 These figures /.S 2 ZS 33.54 45 WAVE: LENGTH FIG. 1. Energy distribution curve of a black body for different temperatures. show 9 per cent of the total energy radiated by a 50 watt lamp in the visible spectrum, and 18 per cent for a 10 or 30 kw. lamp. Reference will be made later, in connection with water cooling, to a 1500 watt lamp, and it should be noted here that less than 1.0 per cent of its radiant energy is in the ultra-violet, 13.5 per cent in the visible, and about 85 per cent in the infra-red spectra. In round numbers, 85 per cent of the energy radiated by a 1500 watt tungsten lamp is in the infra-red region, and constitutes the heat which we desire to eliminate. 1 HOU,ADAY, L. L.: "Proportion of Energy Radiated by Incandescent Solids in Various Spectral Regions," /. 0. 5. A., 17 (1928), p. 329.