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 #:
000355
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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338 N. T. GORDON [J. S. M. P. E. the lamp, energy dissipated in the circulating water, and light output. The energy dissipated in the circulating water was determined by carefully measuring the rate of flow and the temperature of the incoming and outgoing water. Conversion from the calories so obtained to watts showed that 75 per cent of the watts input was dissipated in the circulating water. Candle power measurements were made on the horizontal photometer, and also in the spherical photometer. Readings were taken both with and without the water jacket attached to the unit to determine the amount of light absorbed by the FIG. 4. A 1500 watt water cooled lamp unit. combined water and jacket. These figures are presented in Table III and show 93 to 95 per cent light transmitted. Seventy-five per cent of the total energy is dissipated by the cooling system. The lumen output from the complete unit with water cell, base plate, coil, and base is 80 per cent of that from the bare lamp without a fixture. This figure is subject to a revision of a few per cent because an oxidized fixture was employed in the spherical candle power measurements. In order to maintain an illumination from the water cooled lamp equal to that from the 1500 watt lamp without the water jacket it would be necessary to increase the watts in the water cooled lamp about