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  1. J. Hartmann, Zeits. f. Instrumentenk. 19, 97 and 842 (1899).
  2. P. P. Koch, Ann. d. Physik 30, 841 (1909); 34, 377 (1911).
  3. This procedure is described in F. Twyman's Spectrochemical Analysis of Metals and Alloys (Chemical Publishing Company, Brooklyn, New York, 1941), p. 97.
  4. L. Silberstein, J. Opt. Soc. Am. 32, 474 (1942).
  5. J. H. Webb, J. Opt. Soc. Am. 29, 314 (1939).
  6. C. K. Mees, The Theory of Photographic Process (D. Van Nostrand Company, Inc., New York, 1943).
  7. It should be emphasized that the measured transparency depends to a certain extent on the type of densitometer used: the difference between the “specular” and the “diffuse” transparency, as a result of the scattering of light in the emulsion. The theoretical notion of transparency (or density), as well as the measured values of this quantity are therefore somewhat indefinite.
  8. J. S. Owens, Metals and Alloys 9, 15 (1938).
  9. See, for instance, Dorgelo, Physik. Zeits. 26, 756 (1925).
  10. J. S. Owens, reference 8.
  11. If the intensity ratio assigned to the gamma-pair is the true ratio, the calibration curve will yield true ratios only for wave-lengths in the immediate vicinity of the gamma-pair. For other wave-lengths the calibration curve will in general not yield true ratios anyhow. The fact that one calibration curve is often successfully used for working pairs widely scattered in the spectrum seems to indicate that the units of the log intensity axis of the characteristic curves for different wave-lengths are approximately proportional on plates of changeable contrast. Some direct determinations of the characteristic curves for different wave-lengths made on plates with different contrasts seem to support this conclusion. More work has to be done, however, in order to obtain conclusive results.

Hartmann, J.

J. Hartmann, Zeits. f. Instrumentenk. 19, 97 and 842 (1899).

Koch, P. P.

P. P. Koch, Ann. d. Physik 30, 841 (1909); 34, 377 (1911).

Mees, C. K.

C. K. Mees, The Theory of Photographic Process (D. Van Nostrand Company, Inc., New York, 1943).

Owens, J. S.

J. S. Owens, Metals and Alloys 9, 15 (1938).

J. S. Owens, reference 8.

Silberstein, L.

L. Silberstein, J. Opt. Soc. Am. 32, 474 (1942).

Twyman’s, F.

This procedure is described in F. Twyman's Spectrochemical Analysis of Metals and Alloys (Chemical Publishing Company, Brooklyn, New York, 1941), p. 97.

Webb, J. H.

J. H. Webb, J. Opt. Soc. Am. 29, 314 (1939).

Other (11)

J. Hartmann, Zeits. f. Instrumentenk. 19, 97 and 842 (1899).

P. P. Koch, Ann. d. Physik 30, 841 (1909); 34, 377 (1911).

This procedure is described in F. Twyman's Spectrochemical Analysis of Metals and Alloys (Chemical Publishing Company, Brooklyn, New York, 1941), p. 97.

L. Silberstein, J. Opt. Soc. Am. 32, 474 (1942).

J. H. Webb, J. Opt. Soc. Am. 29, 314 (1939).

C. K. Mees, The Theory of Photographic Process (D. Van Nostrand Company, Inc., New York, 1943).

It should be emphasized that the measured transparency depends to a certain extent on the type of densitometer used: the difference between the “specular” and the “diffuse” transparency, as a result of the scattering of light in the emulsion. The theoretical notion of transparency (or density), as well as the measured values of this quantity are therefore somewhat indefinite.

J. S. Owens, Metals and Alloys 9, 15 (1938).

See, for instance, Dorgelo, Physik. Zeits. 26, 756 (1925).

J. S. Owens, reference 8.

If the intensity ratio assigned to the gamma-pair is the true ratio, the calibration curve will yield true ratios only for wave-lengths in the immediate vicinity of the gamma-pair. For other wave-lengths the calibration curve will in general not yield true ratios anyhow. The fact that one calibration curve is often successfully used for working pairs widely scattered in the spectrum seems to indicate that the units of the log intensity axis of the characteristic curves for different wave-lengths are approximately proportional on plates of changeable contrast. Some direct determinations of the characteristic curves for different wave-lengths made on plates with different contrasts seem to support this conclusion. More work has to be done, however, in order to obtain conclusive results.

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