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  1. Science, Vol.  xliii, p. 185, 1916.
  2. See paper by Crittenden and Richtmyer, “An ‘Average Eye’ for Heterochromatic Photometry, and a Comparison of a Flicker with an Equality of Brightness Photometer.” Trans. Ill. Eng. Soc., Vol. xi, p. 331, 1916, and .
  3. Ann. d. Ph., Vol.  xxxi, p. 676 (1887).
  4. Zeit. fur Inst., Vol.  ix, p. 41 (Feb., 1889).
  5. Zeit. fur Inst., Vol.  ix, 461 (Dec., 1889).
  6. Jour. f. Gasbeleuchtung, Vol.  xliii, p. 251 (1900).
  7. Electrician (London), Vol.  lx, p. 122 (Nov., 1907).
  8. Proc. Natl. Elect. Light Assn., 1908.Abstract in Elect. World, Vol.  li, p. 1104 (1908).
  9. Elect. World, Vol.  li, p. 1152 (1908).
  10. Trans. Ill. Eng. Soc., Vol  viii, p. 633 (1913).
  11. Sitzungsber, Akad. Wiss.Berlin, 1888, p. 917.
  12. Uppenborn and MonaschLehrbuch der Photometrie, R. Oldenbourg, Munich and Berlin, 1912, p. 212.
  13. For brevity of expression we will hereafter designate this color difference as “carbon-yellow,” and similarly the expressions “carbon-blue,” “carbon-tungsten,” “carbon-gas-filled,” etc., will have an obvious meaning.

1916 (1)

Science, Vol.  xliii, p. 185, 1916.

1913 (1)

Trans. Ill. Eng. Soc., Vol  viii, p. 633 (1913).

1908 (2)

Proc. Natl. Elect. Light Assn., 1908.Abstract in Elect. World, Vol.  li, p. 1104 (1908).

Elect. World, Vol.  li, p. 1152 (1908).

1900 (1)

Jour. f. Gasbeleuchtung, Vol.  xliii, p. 251 (1900).

1889 (2)

Zeit. fur Inst., Vol.  ix, p. 41 (Feb., 1889).

Zeit. fur Inst., Vol.  ix, 461 (Dec., 1889).

1887 (1)

Ann. d. Ph., Vol.  xxxi, p. 676 (1887).

Crittenden,

See paper by Crittenden and Richtmyer, “An ‘Average Eye’ for Heterochromatic Photometry, and a Comparison of a Flicker with an Equality of Brightness Photometer.” Trans. Ill. Eng. Soc., Vol. xi, p. 331, 1916, and .

Monasch,

Uppenborn and MonaschLehrbuch der Photometrie, R. Oldenbourg, Munich and Berlin, 1912, p. 212.

Richtmyer,

See paper by Crittenden and Richtmyer, “An ‘Average Eye’ for Heterochromatic Photometry, and a Comparison of a Flicker with an Equality of Brightness Photometer.” Trans. Ill. Eng. Soc., Vol. xi, p. 331, 1916, and .

Sitzungsber,

Sitzungsber, Akad. Wiss.Berlin, 1888, p. 917.

Uppenborn,

Uppenborn and MonaschLehrbuch der Photometrie, R. Oldenbourg, Munich and Berlin, 1912, p. 212.

Ann. d. Ph. (1)

Ann. d. Ph., Vol.  xxxi, p. 676 (1887).

Elect. World (1)

Elect. World, Vol.  li, p. 1152 (1908).

Electrician (London) (1)

Electrician (London), Vol.  lx, p. 122 (Nov., 1907).

Jour. f. Gasbeleuchtung (1)

Jour. f. Gasbeleuchtung, Vol.  xliii, p. 251 (1900).

Proc. Natl. Elect. Light Assn. (1)

Proc. Natl. Elect. Light Assn., 1908.Abstract in Elect. World, Vol.  li, p. 1104 (1908).

Science (1)

Science, Vol.  xliii, p. 185, 1916.

Trans. Ill. Eng. Soc. (1)

Trans. Ill. Eng. Soc., Vol  viii, p. 633 (1913).

Zeit. fur Inst. (2)

Zeit. fur Inst., Vol.  ix, p. 41 (Feb., 1889).

Zeit. fur Inst., Vol.  ix, 461 (Dec., 1889).

Other (4)

See paper by Crittenden and Richtmyer, “An ‘Average Eye’ for Heterochromatic Photometry, and a Comparison of a Flicker with an Equality of Brightness Photometer.” Trans. Ill. Eng. Soc., Vol. xi, p. 331, 1916, and .

Sitzungsber, Akad. Wiss.Berlin, 1888, p. 917.

Uppenborn and MonaschLehrbuch der Photometrie, R. Oldenbourg, Munich and Berlin, 1912, p. 212.

For brevity of expression we will hereafter designate this color difference as “carbon-yellow,” and similarly the expressions “carbon-blue,” “carbon-tungsten,” “carbon-gas-filled,” etc., will have an obvious meaning.

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Figures (1)

Tables (9)

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Table III Photometer: Lummer-Brodhun Contrast.

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Table IV Photometer: Lummer-Brodhun Contrast.

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Table V Showing Precision as a Function of Flicker Speed

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Table VI Flicker Photometer.

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Table VII Comparison of Flicker with Equality-of-Brightness Measurements in 2° Field

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Table VIII Photometer: Flicker

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Table IX Agreement Between the Means of Successive Sets of Readings

Equations (3)

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a . d = 1.2 E
Aver . dist . = 4 × 0.23 + 6 × 0.15 10 = 0.18 cm .
a . d . = 100 × 2 × 0.18 36.81 = 0.98 %