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References

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  1. Astrophys. J. 58, p. 294; Dec.1923.
    [Crossref]
  2. J.O.S.A.,  12, p. 75; Feb.1926.
    [Crossref]
  3. Astrophys. J.,  33, p. 91; March1911.
    [Crossref]
  4. Ibid,  37, p. 380; June1913.
  5. Ibid,  37, p. 164; April1913.
  6. Bulletin Bureau Standards,  11, p. 41; 1915.
  7. Astrophys. J.,  37, p. 194; April1913.
    [Crossref]
  8. Phys. Rev., N.S.,  10, p. 377; Oct.1917.
    [Crossref]
  9. Astrophys. J.,  45, p. 149; April1917.
    [Crossref]
  10. Phys. Rev., N.S.,  14, p. 427; Nov.1919.
    [Crossref]
  11. J.O.S.A. & R.S.T.,  6, p. 476; July1922.
    [Crossref]
  12. Ibid,  6, p. 481; July1922.
  13. Astrophys. J.,  36, p. 114; Sept.1912.
  14. J.O.S.A. & R.S.I.,  7, p. 1115; Dec.1923.
    [Crossref]
  15. Phys. Rev., N.S.,  14, p. 379; Nov.1919.
    [Crossref]
  16. Trans. Illum. Eng. Soc.,  16, p. 419; Nov.1921.
  17. Phys. Rev.,  25, p. 1; July1907.
  18. J. Frank. Inst.,  186, p. 401; Oct.1918.
    [Crossref]
  19. Phys. Rev.,  20, p. 101; July1922.

1926 (1)

J.O.S.A.,  12, p. 75; Feb.1926.
[Crossref]

1923 (2)

Astrophys. J. 58, p. 294; Dec.1923.
[Crossref]

J.O.S.A. & R.S.I.,  7, p. 1115; Dec.1923.
[Crossref]

1922 (3)

J.O.S.A. & R.S.T.,  6, p. 476; July1922.
[Crossref]

Ibid,  6, p. 481; July1922.

Phys. Rev.,  20, p. 101; July1922.

1921 (1)

Trans. Illum. Eng. Soc.,  16, p. 419; Nov.1921.

1919 (2)

Phys. Rev., N.S.,  14, p. 379; Nov.1919.
[Crossref]

Phys. Rev., N.S.,  14, p. 427; Nov.1919.
[Crossref]

1918 (1)

J. Frank. Inst.,  186, p. 401; Oct.1918.
[Crossref]

1917 (2)

Phys. Rev., N.S.,  10, p. 377; Oct.1917.
[Crossref]

Astrophys. J.,  45, p. 149; April1917.
[Crossref]

1915 (1)

Bulletin Bureau Standards,  11, p. 41; 1915.

1913 (3)

Astrophys. J.,  37, p. 194; April1913.
[Crossref]

Ibid,  37, p. 380; June1913.

Ibid,  37, p. 164; April1913.

1912 (1)

Astrophys. J.,  36, p. 114; Sept.1912.

1911 (1)

Astrophys. J.,  33, p. 91; March1911.
[Crossref]

1907 (1)

Phys. Rev.,  25, p. 1; July1907.

Astrophys. J. (5)

Astrophys. J. 58, p. 294; Dec.1923.
[Crossref]

Astrophys. J.,  33, p. 91; March1911.
[Crossref]

Astrophys. J.,  37, p. 194; April1913.
[Crossref]

Astrophys. J.,  45, p. 149; April1917.
[Crossref]

Astrophys. J.,  36, p. 114; Sept.1912.

Bulletin Bureau Standards (1)

Bulletin Bureau Standards,  11, p. 41; 1915.

Ibid (3)

Ibid,  6, p. 481; July1922.

Ibid,  37, p. 380; June1913.

Ibid,  37, p. 164; April1913.

J. Frank. Inst. (1)

J. Frank. Inst.,  186, p. 401; Oct.1918.
[Crossref]

J.O.S.A. (1)

J.O.S.A.,  12, p. 75; Feb.1926.
[Crossref]

J.O.S.A. & R.S.I. (1)

J.O.S.A. & R.S.I.,  7, p. 1115; Dec.1923.
[Crossref]

J.O.S.A. & R.S.T. (1)

J.O.S.A. & R.S.T.,  6, p. 476; July1922.
[Crossref]

Phys. Rev. (2)

Phys. Rev.,  25, p. 1; July1907.

Phys. Rev.,  20, p. 101; July1922.

Phys. Rev., N.S. (3)

Phys. Rev., N.S.,  14, p. 379; Nov.1919.
[Crossref]

Phys. Rev., N.S.,  14, p. 427; Nov.1919.
[Crossref]

Phys. Rev., N.S.,  10, p. 377; Oct.1917.
[Crossref]

Trans. Illum. Eng. Soc. (1)

Trans. Illum. Eng. Soc.,  16, p. 419; Nov.1921.

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Figures (2)

F. 1
F. 1

Some radiational characteristics of a black body for diffetent temperatures. Curve A. Lumens per watt. Curve B. Percentage of the energy between the wave-length limits 0.4μ and 0.76μ. Curve C. Lumens per watt for the energy between the wave-length limits 0.4μ and 0.76μ.

F. 2
F. 2

Photograph showing Worthing’s tungsten tube black body with pyrometer filament projected against small radial hole.

Tables (5)

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Table 1 Black body luminous characteristics.

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Table 2 Values obtained for color matching lamp No. 5 against lamp No. 4 by a number of observers.

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Table 3 Intercomparison of color scales.

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Table 4 Temperature and efficiency of tungsten lamps.

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Table 5 Color temperature, brightness temperature, and brightness of various illuminants.

Equations (2)

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E λ ( the brightness ) = ( c 1 λ 5 e c 2 / λ T 1 ) b b = ( c 1 λ 5 e c 2 / λ S 1 ) x = ( e λ c 1 λ 5 e c 2 / λ T 1 1 ) x
E = e t σ T 4