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  1. Published by permission of the Director, Bureau of Standards.The author is indebted to K. S. Gibson, H. J. McNicholas and M. C. Malamphy for assistance in some of the computations leading to the results given in this paper. The figures have been drawn by Miss Gertrude Clemens.
  2. Phys. Rev. (2)  6, p. 64, July, 1915;Phys. Rev. (2)  9, p. 341, Apr., 1917;Phys. Rev. (2)  10, p. 208, Aug., 1917;Phys. Rev. (2)  11, p. 502, June, 1918;Phys. Rev. (2)  14, p. 264, Sept., 1919;Phys. Rev. (2)  15, p. 538. June, 1920.J. Op. Soc. Am., Nov.1920.
  3. E.g., Troland: Trans. I. E. S.,  13, p. 26, 1918. Priest: New Study of the Leucoscope, J. Op. Soc. Am., Nov., 1920.
  4. Temperatures up to about 3000° K can be attained in actual incandescent sources—gas-filled tungsten lamps.
  5. The Application of Rotatory Dispersion to Colorimetry, B. S. Sci. Paper.
  6. B. S. Lamp 1717. The color temperature has been derived from the energy distribution curve determined radiometrically by Dr. W. W. Coblentz.
  7. Cf. Priest: A New Study of the Leucoscope, Appendix I, J. Op. Soc. Am., Nov., 1920.
  8. Ann. der Phys. (4)  33, p. 799, year 1910;and Ann. der Phys. (4)  39, p. 545, year 1912.
  9. See abstract, “The Spectral Distribution of Energy Required to Evoke the Gray Sensation,” elsewhere in this number of this Journal.

1920 (1)

Cf. Priest: A New Study of the Leucoscope, Appendix I, J. Op. Soc. Am., Nov., 1920.

1918 (1)

E.g., Troland: Trans. I. E. S.,  13, p. 26, 1918. Priest: New Study of the Leucoscope, J. Op. Soc. Am., Nov., 1920.

1915 (1)

Phys. Rev. (2)  6, p. 64, July, 1915;Phys. Rev. (2)  9, p. 341, Apr., 1917;Phys. Rev. (2)  10, p. 208, Aug., 1917;Phys. Rev. (2)  11, p. 502, June, 1918;Phys. Rev. (2)  14, p. 264, Sept., 1919;Phys. Rev. (2)  15, p. 538. June, 1920.J. Op. Soc. Am., Nov.1920.

1910 (1)

Ann. der Phys. (4)  33, p. 799, year 1910;and Ann. der Phys. (4)  39, p. 545, year 1912.

Priest,

Cf. Priest: A New Study of the Leucoscope, Appendix I, J. Op. Soc. Am., Nov., 1920.

Troland,

E.g., Troland: Trans. I. E. S.,  13, p. 26, 1918. Priest: New Study of the Leucoscope, J. Op. Soc. Am., Nov., 1920.

Ann. der Phys. (1)

Ann. der Phys. (4)  33, p. 799, year 1910;and Ann. der Phys. (4)  39, p. 545, year 1912.

J. Op. Soc. Am. (1)

Cf. Priest: A New Study of the Leucoscope, Appendix I, J. Op. Soc. Am., Nov., 1920.

Phys. Rev. (1)

Phys. Rev. (2)  6, p. 64, July, 1915;Phys. Rev. (2)  9, p. 341, Apr., 1917;Phys. Rev. (2)  10, p. 208, Aug., 1917;Phys. Rev. (2)  11, p. 502, June, 1918;Phys. Rev. (2)  14, p. 264, Sept., 1919;Phys. Rev. (2)  15, p. 538. June, 1920.J. Op. Soc. Am., Nov.1920.

Trans. I. E. S. (1)

E.g., Troland: Trans. I. E. S.,  13, p. 26, 1918. Priest: New Study of the Leucoscope, J. Op. Soc. Am., Nov., 1920.

Other (5)

Temperatures up to about 3000° K can be attained in actual incandescent sources—gas-filled tungsten lamps.

The Application of Rotatory Dispersion to Colorimetry, B. S. Sci. Paper.

B. S. Lamp 1717. The color temperature has been derived from the energy distribution curve determined radiometrically by Dr. W. W. Coblentz.

Published by permission of the Director, Bureau of Standards.The author is indebted to K. S. Gibson, H. J. McNicholas and M. C. Malamphy for assistance in some of the computations leading to the results given in this paper. The figures have been drawn by Miss Gertrude Clemens.

See abstract, “The Spectral Distribution of Energy Required to Evoke the Gray Sensation,” elsewhere in this number of this Journal.

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Figures (7)

F. 1
F. 1

Spectral Distribution of Energy.

F. 2
F. 2

Simple Arrangement of One Quartz Plate Between Nicols.

F. 3
F. 3

Duplex Arrangement of Two Quartz Plates and Three Nicols.

F. 4
F. 4

Illustrating the Production of Radiant Energy Having the Spectral Distribution of a Complete Radiator by Means of the Simple Apparatus (Fig. 2).

F. 5
F. 5

Illustrating the Production of Radiant Energy Having the Spectral Distribution of a Complete Radiator by Means of the Duplex Apparatus (Fig. 3).

F. 6
F. 6

Temperature of Energy Distribution as a Function of ϕ with the Arrangement shown in Fig. 2. (Plotted from inspection of Fig. 4.)

F. 7
F. 7

Temperature of Energy Distribution as a Function of ϕ2 (for ϕ1 = 170°) with the Arrangement shown in Fig. 3. (Plotted from inspection of Fig. 5.)

Equations (2)

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sin 2 ( ϕ 0.5 α λ ) ;
sin 2 ( ϕ 1 0.5 α λ ) sin 2 ( ϕ 2 0.5 α λ ) ;