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References

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  1. Astrophys. Jour.,  42, p. 294, 1915.
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1915 (1)

Astrophys. Jour.,  42, p. 294, 1915.
[Crossref]

Astrophys. Jour. (1)

Astrophys. Jour.,  42, p. 294, 1915.
[Crossref]

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Figures (4)

F. 1
F. 1

Spectral transmission of different screens. Curve B, two thicknesses blue uviol glass, total thickness 3.9 mm.Curve G, two thicknesses green glass, total thickness 5.2 mm.Curve R, two thicknesses Jena red glass, total thickness 6.8 mm.

F. 2
F. 2

Effective wave-length for Jena red glass. Curve A, effective wave-length from 1300°K to other temperatures.Curve B, effective wave-length from 1800 to other temperatures.Curve D, effective wave-length from 2400 to other temperatures.Curve E, effective wave-length from 3600 to other temperatures.Curve C, limiting effective wave-length.

F. 3
F. 3

Effective wave-length of green glass. Curve A, effective wave-length from 1300°K to other temperatures.Curve B, effective wave-length from 1800 to other temperatures.Curve D, effective wave-length from 2400 to other temperatures.Curve E, effective wave-length from 3000 to other temperatures.Curve C, limiting effective wave-length.

F. 4
F. 4

Effective wave-length for blue glass. Curve A, effective wave-length from 1000°K to other temperatures.Curve B, effective wave-length from 1300 to other temperatures.Curve C, effective wave-length from 1800 to other temperatures.Curve D, effective wave-length from 2400 to other temperatures.Curve E, effective wave-length from 3600 to other temperatures.Curve F, limiting effective wave-length.

Tables (3)

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Table I Percentage of the Total Light from a Black Body at Different Temperatures Transmitted by Different Glasses.

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Table II Percentage Range in Current Through Pyrometer Filament for Brightness Matches with the Background Under Various Conditions and for Different Colored Screens in the Eyepiece.

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Table III Settings by Individual Observers Using Different Monochromatic Glass Screens.

Equations (3)

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T R = 0 J ( λ T ) V λ T d λ 0 J ( λ T ) V λ d λ
[ J ( λ T 1 ) J ( λ T 2 ) ] λ e = 0 J ( λ T 1 ) V λ t d λ 0 J ( λ T 2 ) V λ t d λ
log t 1 log t 2 = λ 1 λ 2