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References

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  1. Gelhoff, Science Abstracts, No. 431; 1921.
  2. Howe, Physical Review,  8, p. 674; 1916.
    [Crossref]
  3. Anderson, Astrophysical Journal,  51, p. 37; 1920.
    [Crossref]
  4. Ham, Fehr, and Bitner, Journal of the Franklin Institute,  178, p. 299; 1914.
    [Crossref]
  5. Schwarzschild, Astrophysical Journal,  11, p. 89; 1900.
    [Crossref]
  6. See Mallet, Philosophical Magazine,  44, p. 904; 1922.
    [Crossref]
  7. See Helmick, Physical Review,  17, p. 135; 1921.
    [Crossref]
  8. Helmick, Physical Review,  11, p. 372; 1918.
    [Crossref]
  9. See Helmick, Physical Review,  17, p. 135; 1921; also Ross, Journal of the Optical Society of America and Review of Scientific Instruments, September, 1920.
    [Crossref]
  10. Ross, Astrophysical Journal,  25, p. 86; 1920.
    [Crossref]
  11. Duclaux and Jeantet, Journal de Physique,  11, p. 154; 1921.
  12. Lyman, Science, p. 48; July20, 1921.

1922 (1)

See Mallet, Philosophical Magazine,  44, p. 904; 1922.
[Crossref]

1921 (5)

See Helmick, Physical Review,  17, p. 135; 1921.
[Crossref]

See Helmick, Physical Review,  17, p. 135; 1921; also Ross, Journal of the Optical Society of America and Review of Scientific Instruments, September, 1920.
[Crossref]

Gelhoff, Science Abstracts, No. 431; 1921.

Duclaux and Jeantet, Journal de Physique,  11, p. 154; 1921.

Lyman, Science, p. 48; July20, 1921.

1920 (2)

Anderson, Astrophysical Journal,  51, p. 37; 1920.
[Crossref]

Ross, Astrophysical Journal,  25, p. 86; 1920.
[Crossref]

1918 (1)

Helmick, Physical Review,  11, p. 372; 1918.
[Crossref]

1916 (1)

Howe, Physical Review,  8, p. 674; 1916.
[Crossref]

1914 (1)

Ham, Fehr, and Bitner, Journal of the Franklin Institute,  178, p. 299; 1914.
[Crossref]

1900 (1)

Schwarzschild, Astrophysical Journal,  11, p. 89; 1900.
[Crossref]

Anderson,

Anderson, Astrophysical Journal,  51, p. 37; 1920.
[Crossref]

Bitner,

Ham, Fehr, and Bitner, Journal of the Franklin Institute,  178, p. 299; 1914.
[Crossref]

Duclaux,

Duclaux and Jeantet, Journal de Physique,  11, p. 154; 1921.

Fehr,

Ham, Fehr, and Bitner, Journal of the Franklin Institute,  178, p. 299; 1914.
[Crossref]

Gelhoff,

Gelhoff, Science Abstracts, No. 431; 1921.

Ham,

Ham, Fehr, and Bitner, Journal of the Franklin Institute,  178, p. 299; 1914.
[Crossref]

Helmick,

See Helmick, Physical Review,  17, p. 135; 1921.
[Crossref]

See Helmick, Physical Review,  17, p. 135; 1921; also Ross, Journal of the Optical Society of America and Review of Scientific Instruments, September, 1920.
[Crossref]

Helmick, Physical Review,  11, p. 372; 1918.
[Crossref]

Howe,

Howe, Physical Review,  8, p. 674; 1916.
[Crossref]

Jeantet,

Duclaux and Jeantet, Journal de Physique,  11, p. 154; 1921.

Lyman,

Lyman, Science, p. 48; July20, 1921.

Mallet,

See Mallet, Philosophical Magazine,  44, p. 904; 1922.
[Crossref]

Ross,

Ross, Astrophysical Journal,  25, p. 86; 1920.
[Crossref]

Schwarzschild,

Schwarzschild, Astrophysical Journal,  11, p. 89; 1900.
[Crossref]

Astrophysical Journal (3)

Anderson, Astrophysical Journal,  51, p. 37; 1920.
[Crossref]

Schwarzschild, Astrophysical Journal,  11, p. 89; 1900.
[Crossref]

Ross, Astrophysical Journal,  25, p. 86; 1920.
[Crossref]

Journal de Physique (1)

Duclaux and Jeantet, Journal de Physique,  11, p. 154; 1921.

Journal of the Franklin Institute (1)

Ham, Fehr, and Bitner, Journal of the Franklin Institute,  178, p. 299; 1914.
[Crossref]

Philosophical Magazine (1)

See Mallet, Philosophical Magazine,  44, p. 904; 1922.
[Crossref]

Physical Review (4)

See Helmick, Physical Review,  17, p. 135; 1921.
[Crossref]

Helmick, Physical Review,  11, p. 372; 1918.
[Crossref]

See Helmick, Physical Review,  17, p. 135; 1921; also Ross, Journal of the Optical Society of America and Review of Scientific Instruments, September, 1920.
[Crossref]

Howe, Physical Review,  8, p. 674; 1916.
[Crossref]

Science (1)

Lyman, Science, p. 48; July20, 1921.

Science Abstracts (1)

Gelhoff, Science Abstracts, No. 431; 1921.

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Figures (8)

Fig. 1
Fig. 1

On the left, curves giving the relation between density and log time for various intensities of light of wavelength 2144 A. On the right, similar curves giving the relation between density and log intensity for various times of exposure.

Fig. 2
Fig. 2

Same as Fig. 1, for light of wave length 2350 A.

Fig. 3
Fig. 3

Same as Fig. 1, for light of wave length 2730 A.

Fig. 4
Fig. 4

Same as Fig. 1, for light of wave length 4840 A.

Fig. 5
Fig. 5

Photograph of three “characteristic surfaces” for an emulsion exposed to light of three different wave lengths. On the left, 2144 A, center 2350 A, and right 4840 A.

Fig. 6
Fig. 6

Curves showing the relation between density and log time, total energy constant, for the wave lengths marked on the curves.

Fig. 7
Fig. 7

Typical density-log time curves on the left, and density-log intensity curves on the right, taken from the central regions of characteristic surfaces for the wave lengths marked.

Fig. 8
Fig. 8

Curves showing the change in the characteristic curve of an emulsion produced by bathing it in fluorescent paraffin oil. Dotted curves are for oiled film, while solid curves refer to normal film. For the pairs of curves marked with the same wavelength conditions were identical as far as exposure is concerned.

Tables (3)

Tables Icon

Table 1 Calibration of wire screens to total radiation from mercury arc

Tables Icon

Table 2 Densities produced by light of wave length 2144 A of various intensities and for various limes of exposure.

Tables Icon

Table 3 Values of the ratio of the opacity of an oiled emulsion to that of a normal emulsion under identical conditions, for various intensities, exposure times, and wave lengths.

Equations (3)

Equations on this page are rendered with MathJax. Learn more.

d = γ log I t c
d = γ log I t p c
d = γ log I + p γ log t c