Abstract

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.

© 1949 Optical Society of America

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References

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  1. C. E. Harvey, A method of semi-quantitative spectrographs analysis (Applied Research Laboratories, Glendale, California, 1947).
  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. Feldman 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).

Harvey, C. E.

C. E. Harvey, A method of semi-quantitative spectrographs analysis (Applied Research Laboratories, Glendale, California, 1947).

Mees, C. E. K.

C. E. K. Mees, The Theory of the Photographic Process (The Macmillan Company, New York, 1942).

Other (3)

C. E. Harvey, A method of semi-quantitative spectrographs analysis (Applied Research Laboratories, Glendale, California, 1947).

C. E. K. Mees, The Theory of the Photographic Process (The Macmillan Company, New York, 1942).

Following the publication of the abstract of this paper in the program of the winter meeting of the Society, March 10–12, 1949,C. Feldman 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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Figures (5)

F. 1
F. 1

Comparison of logτ- and modified τ-scales.

F. 2
F. 2

Emulsion calibration curves plotted with modified τ-scale. Gammas of these curves are as follows: (A) 2.15, (B) 1.86, (C) 1.60, (D) 1.64, and (E) 1.49.

F. 3
F. 3

Emulsion calibration curves plotted with modified τ-scale. Gammas of these curves are as follows: (A) 1.68, (B) 1.59, (C) 1.48, (D) 1.57, (E) 1.36, (F) 1.24, (G) 0.91, (H) 1.28, and (I) 0.96.

F. 4
F. 4

Substitution of an arbitrary line for the emulsion calibration.

F. 5
F. 5

Transmittance slide rule for use in the determination of tetraethyl lead in gasoline.

Tables (1)

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Table I Table of τ-coordinate distances.

Equations (3)

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f ( τ ) = log τ / ( 1 τ ) 0.4 e τ .
log ( Σ u / Σ s ) = 1 / γ { f ( τ u ) f ( τ s ) } .
log ( Σ u / Σ s ) = 1 / γ { f ( τ u ) f ( τ s ) } ,