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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 39, Iss. 6 — Jun. 1, 1949
  • pp: 501–502

Emulsion Calibration Scale for Quantitative Spectroscopic Analysis

HAROLD K. HUGHES and R. W. MURPHY  »View Author Affiliations

JOSA, Vol. 39, Issue 6, pp. 501-502 (1949)

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The time devoted to collecting and plotting emulsion calibration data can be reduced considerably by the use of a new transmittance scale which is logarithmic from 1 to 30 percent and which then expands non-uniformly to 97 percent. Data are presented from seven independent laboratories which establish the approximate linearity of the emulsion calibration curves for Eastman SA-1 films, SA-1 plates, SA-2 films, I-N plates, and 33 plates. The practical uses of this scale on plotting boards and in a special emulsion calibration paper are discussed.

In certain cases, all emulsion calibration procedures can be eliminated. A transmittance slide rule for use in the quantitative determination of tetraethyl lead in gasoline is described.

HAROLD K. HUGHES and R. W. MURPHY, "Emulsion Calibration Scale for Quantitative Spectroscopic Analysis," J. Opt. Soc. Am. 39, 501-502 (1949)

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  1. C. E. Harvey, A method of semi-quantitative spectrographs analysis (Applied Research Laboratories, Glendale, California, 1947),501
  2. C. E. K. Mees, The Theory of the Photographic Process (The Macmillan Company, New York, 1942).
  3. Following the publication of the abstract of this paper in the program of the winter meeting of the Society, March 10-12, 1949, C. Fcldman called the authors' attention to the work of H. Kaiser, Spectrochem. Acta 3, 159 (1948). This reference has not been available, but it is understood that Kaiser uses the first term on the right of Eq. (1).

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