Abstract

The latest values for the constants of the black body are used, in conjunction with the Gibson-Tyndall luminous efficiency curve of the spectrum, to compute the luminous efficiency and brightness of the black body over a large range of temperatures. The value.00161 watts per lumen is used for the least mechanical equivalent of light. The computed values agree everywhere to within one per cent with the most recent experimental values.

© 1926 Optical Society of America

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References

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  1. For references covering this whole subject, see Ives, The Photometric Scale, Jour. Franklin Institute, 188, p. 217; 1919.
  2. Gibson and Tyndall, B. S. Sci. Paper, 475; 1923.
  3. Tyndall and Gibson, J. O. S. A. & R. S. I. 9, p. 403; 1924.
    [CrossRef]
  4. Ives, Coblentz, and Kingsbury, Phys. Rev. 5, p. 269; 1915and Phys. Rev. 6, p. 319; 1915.
    [CrossRef]
  5. Holst and Visser, Proc. Kon: Akad: Amsterdam20, p. 1036; 1918.
  6. Hyde, Forsythe, and Cady, Phys. Rev. 13, p. 45; 1919.
    [CrossRef]
  7. Ives, J. O. S. A. & R. S. I. 9, p. 635; 1924.
    [CrossRef]

1924 (2)

Tyndall and Gibson, J. O. S. A. & R. S. I. 9, p. 403; 1924.
[CrossRef]

Ives, J. O. S. A. & R. S. I. 9, p. 635; 1924.
[CrossRef]

1923 (1)

Gibson and Tyndall, B. S. Sci. Paper, 475; 1923.

1919 (1)

Hyde, Forsythe, and Cady, Phys. Rev. 13, p. 45; 1919.
[CrossRef]

1915 (1)

Ives, Coblentz, and Kingsbury, Phys. Rev. 5, p. 269; 1915and Phys. Rev. 6, p. 319; 1915.
[CrossRef]

Cady,

Hyde, Forsythe, and Cady, Phys. Rev. 13, p. 45; 1919.
[CrossRef]

Coblentz,

Ives, Coblentz, and Kingsbury, Phys. Rev. 5, p. 269; 1915and Phys. Rev. 6, p. 319; 1915.
[CrossRef]

Forsythe,

Hyde, Forsythe, and Cady, Phys. Rev. 13, p. 45; 1919.
[CrossRef]

Gibson,

Tyndall and Gibson, J. O. S. A. & R. S. I. 9, p. 403; 1924.
[CrossRef]

Gibson and Tyndall, B. S. Sci. Paper, 475; 1923.

Holst,

Holst and Visser, Proc. Kon: Akad: Amsterdam20, p. 1036; 1918.

Hyde,

Hyde, Forsythe, and Cady, Phys. Rev. 13, p. 45; 1919.
[CrossRef]

Ives,

Ives, J. O. S. A. & R. S. I. 9, p. 635; 1924.
[CrossRef]

Ives, Coblentz, and Kingsbury, Phys. Rev. 5, p. 269; 1915and Phys. Rev. 6, p. 319; 1915.
[CrossRef]

For references covering this whole subject, see Ives, The Photometric Scale, Jour. Franklin Institute, 188, p. 217; 1919.

Kingsbury,

Ives, Coblentz, and Kingsbury, Phys. Rev. 5, p. 269; 1915and Phys. Rev. 6, p. 319; 1915.
[CrossRef]

Tyndall,

Tyndall and Gibson, J. O. S. A. & R. S. I. 9, p. 403; 1924.
[CrossRef]

Gibson and Tyndall, B. S. Sci. Paper, 475; 1923.

Visser,

Holst and Visser, Proc. Kon: Akad: Amsterdam20, p. 1036; 1918.

B. S. Sci. Paper (1)

Gibson and Tyndall, B. S. Sci. Paper, 475; 1923.

J. O. S. A. & R. S. I. (2)

Tyndall and Gibson, J. O. S. A. & R. S. I. 9, p. 403; 1924.
[CrossRef]

Ives, J. O. S. A. & R. S. I. 9, p. 635; 1924.
[CrossRef]

Phys. Rev. (2)

Hyde, Forsythe, and Cady, Phys. Rev. 13, p. 45; 1919.
[CrossRef]

Ives, Coblentz, and Kingsbury, Phys. Rev. 5, p. 269; 1915and Phys. Rev. 6, p. 319; 1915.
[CrossRef]

Other (2)

Holst and Visser, Proc. Kon: Akad: Amsterdam20, p. 1036; 1918.

For references covering this whole subject, see Ives, The Photometric Scale, Jour. Franklin Institute, 188, p. 217; 1919.

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Tables (2)

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Table 2 Black body luminous characteristics