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

Record Details:

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408 FRANK [J. S. M. p. cooling, the electrical and radiating properties are brought under control. An analysis of the spectrum of the quartz mercury arc, without filter, in bands 200 A. wide has been made from 2300 A. to FIG. 4. Vertical type burner for Cooper Hewitt Uviarc Sunlamp. 7000 A. The energy within this range is radiated in a number of spectrum lines with region of zero energy between. The lines in some regions are so numerous as to make their individual measurement a thankless task, and the zone or group method of measurement is best for the purpose in view. The energy analysis shows a grouping of energy about 3000 A., the center of the known therapeutic region, a second grouping about 4000 A., the center of the old photographic