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  1. “The Design of Photoelectric Flicker Photometers,” a forthcoming paper by the authors, gives additional information.
  2. See Hardy and Pineo, “The Errors due to the Finite Size of Holes and Sample in Integrating Spheres,” J. Opt. Soc. Am. 21, 502 (1931).
    [Crossref]
  3. The notation is in accordance with Moon, Scientific Basis of Illuminating Engineering (New York, 1936). The integrating enclosures considered in the paper are fitted with windows of flashed opal glass, which diffuse the light from the sources that are compared by the photo-cell.

1931 (1)

Hardy,

Moon,

The notation is in accordance with Moon, Scientific Basis of Illuminating Engineering (New York, 1936). The integrating enclosures considered in the paper are fitted with windows of flashed opal glass, which diffuse the light from the sources that are compared by the photo-cell.

Pineo,

J. Opt. Soc. Am. (1)

Other (2)

“The Design of Photoelectric Flicker Photometers,” a forthcoming paper by the authors, gives additional information.

The notation is in accordance with Moon, Scientific Basis of Illuminating Engineering (New York, 1936). The integrating enclosures considered in the paper are fitted with windows of flashed opal glass, which diffuse the light from the sources that are compared by the photo-cell.

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Figures (2)

Fig. 1
Fig. 1

Cross sections of enclosures. E = opening for entrance of light; P = opening for photo-cell.

Fig. 2
Fig. 2

A cube, showing construction and location of photo-cell.

Tables (3)

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Table I Summary of experimental results.

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Table II Data Used in calculations.

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Table III Comparison of calculations with experimental results.

Equations (6)

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G 1 A 1 τ .
G 2 [ 2 A 1 ( 1 - ρ 1 ) + A 2 ]
G 2 ( 1 - ρ 2 ) ( S - 2 A 1 - A 2 ) .
G 2 G 1 = τ ( S / A 1 ) ( 1 - ρ 2 ) + [ 2 ( ρ 2 - ρ 1 ) + ( A 2 / A 1 ) ρ 2 ] .
i 2 i 1 = τ ( S / A 1 ) ( 1 - ρ 2 ) + [ 2 ( ρ 2 - ρ 1 ) + ( A 2 / A 1 ) ρ 2 ] ,
i 2 i 1 = τ S A 1 ( 1 - ρ 2 ) + [ 2 ( ρ 2 - ρ 1 2 ) + A 2 A 1 ρ 2 ] .