Abstract

The chief sources of error in the photographic method of comparing light intensities of the same wave-length are the variations in density over the plate caused by its irregular structure and its uneven development. The causes and magnitudes of these errors are studied by exposing plates to a field of illumination the degree of whose uniformity of intensity is measured with a photo-cell and amplifier. The main objections and difficulties ordinarily associated with the photographic method are briefly discussed, and methods are suggested for their control and correction.

© 1934 Optical Society of America

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References

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  1. I. Clyde Cornog, A Study of the Energy Relations in the Helium Spectrum, Phys. Rev. 32, 746 (1928).
    [Crossref]
  2. André Callier, Some Experiments in Photographic Research Work, Phot. J. No.  53, 242 (1913); Olaf Block, The Uniform Development of Dry Plates, Phot. J. No.  61, 425 (1921); W. Clark, Standard Development, Phot. J. No.  69, 76Feb. (1925).
  3. J. Tracy Lay and I. Clyde Cornog, A Light Beam of Uniform Intensity of Cross Section, R. S. I. 4, 600 (1933).
  4. C. B. Neblette, Photography; Its Principles and Practice, D. Van Nostrand, 1931. This treatise contains a very extensive bibliography of theoretical, experimental and practical photography.
  5. George R. Harrison, Instruments and Methods used for Measuring Spectral Light Intensities by Photography, J. O. S. A. and R. S. I. 19, 267 (1929). This paper presents a summary of photographic photometry, and includes an extensive bibliography.
    [Crossref]
  6. Sheppard and Mees, Investigations on the Theory of the Photographic Process, Longmans and Co.1907.
  7. A. H. Nietz, The Theory of Development, p. 141. D. Van Nostrand, 1922.
  8. C. E. Kenneth Mees, Photographic Plates for Use in Spectroscopy and Astronomy, J. O. S. A. 21, 763 (1931).
  9. J. Tracy Lay and I. Clyde Cornog, A Spectrograph Plate Shield, R. S. I. 2, 293 (1931).

1933 (1)

J. Tracy Lay and I. Clyde Cornog, A Light Beam of Uniform Intensity of Cross Section, R. S. I. 4, 600 (1933).

1931 (2)

C. E. Kenneth Mees, Photographic Plates for Use in Spectroscopy and Astronomy, J. O. S. A. 21, 763 (1931).

J. Tracy Lay and I. Clyde Cornog, A Spectrograph Plate Shield, R. S. I. 2, 293 (1931).

1929 (1)

George R. Harrison, Instruments and Methods used for Measuring Spectral Light Intensities by Photography, J. O. S. A. and R. S. I. 19, 267 (1929). This paper presents a summary of photographic photometry, and includes an extensive bibliography.
[Crossref]

1928 (1)

I. Clyde Cornog, A Study of the Energy Relations in the Helium Spectrum, Phys. Rev. 32, 746 (1928).
[Crossref]

1913 (1)

André Callier, Some Experiments in Photographic Research Work, Phot. J. No.  53, 242 (1913); Olaf Block, The Uniform Development of Dry Plates, Phot. J. No.  61, 425 (1921); W. Clark, Standard Development, Phot. J. No.  69, 76Feb. (1925).

Callier, André

André Callier, Some Experiments in Photographic Research Work, Phot. J. No.  53, 242 (1913); Olaf Block, The Uniform Development of Dry Plates, Phot. J. No.  61, 425 (1921); W. Clark, Standard Development, Phot. J. No.  69, 76Feb. (1925).

Clyde Cornog, I.

J. Tracy Lay and I. Clyde Cornog, A Light Beam of Uniform Intensity of Cross Section, R. S. I. 4, 600 (1933).

J. Tracy Lay and I. Clyde Cornog, A Spectrograph Plate Shield, R. S. I. 2, 293 (1931).

I. Clyde Cornog, A Study of the Energy Relations in the Helium Spectrum, Phys. Rev. 32, 746 (1928).
[Crossref]

Harrison, George R.

George R. Harrison, Instruments and Methods used for Measuring Spectral Light Intensities by Photography, J. O. S. A. and R. S. I. 19, 267 (1929). This paper presents a summary of photographic photometry, and includes an extensive bibliography.
[Crossref]

Kenneth Mees, C. E.

C. E. Kenneth Mees, Photographic Plates for Use in Spectroscopy and Astronomy, J. O. S. A. 21, 763 (1931).

Mees,

Sheppard and Mees, Investigations on the Theory of the Photographic Process, Longmans and Co.1907.

Neblette, C. B.

C. B. Neblette, Photography; Its Principles and Practice, D. Van Nostrand, 1931. This treatise contains a very extensive bibliography of theoretical, experimental and practical photography.

Nietz, A. H.

A. H. Nietz, The Theory of Development, p. 141. D. Van Nostrand, 1922.

Sheppard,

Sheppard and Mees, Investigations on the Theory of the Photographic Process, Longmans and Co.1907.

Tracy Lay, J.

J. Tracy Lay and I. Clyde Cornog, A Light Beam of Uniform Intensity of Cross Section, R. S. I. 4, 600 (1933).

J. Tracy Lay and I. Clyde Cornog, A Spectrograph Plate Shield, R. S. I. 2, 293 (1931).

J. O. S. A. (1)

C. E. Kenneth Mees, Photographic Plates for Use in Spectroscopy and Astronomy, J. O. S. A. 21, 763 (1931).

J. O. S. A. and R. S. I. (1)

George R. Harrison, Instruments and Methods used for Measuring Spectral Light Intensities by Photography, J. O. S. A. and R. S. I. 19, 267 (1929). This paper presents a summary of photographic photometry, and includes an extensive bibliography.
[Crossref]

Phot. J. (1)

André Callier, Some Experiments in Photographic Research Work, Phot. J. No.  53, 242 (1913); Olaf Block, The Uniform Development of Dry Plates, Phot. J. No.  61, 425 (1921); W. Clark, Standard Development, Phot. J. No.  69, 76Feb. (1925).

Phys. Rev. (1)

I. Clyde Cornog, A Study of the Energy Relations in the Helium Spectrum, Phys. Rev. 32, 746 (1928).
[Crossref]

R. S. I. (2)

J. Tracy Lay and I. Clyde Cornog, A Spectrograph Plate Shield, R. S. I. 2, 293 (1931).

J. Tracy Lay and I. Clyde Cornog, A Light Beam of Uniform Intensity of Cross Section, R. S. I. 4, 600 (1933).

Other (3)

C. B. Neblette, Photography; Its Principles and Practice, D. Van Nostrand, 1931. This treatise contains a very extensive bibliography of theoretical, experimental and practical photography.

Sheppard and Mees, Investigations on the Theory of the Photographic Process, Longmans and Co.1907.

A. H. Nietz, The Theory of Development, p. 141. D. Van Nostrand, 1922.

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Figures (2)

Fig. 2
Fig. 2

Table of results.

Equations (3)

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

D = log ( δ m / δ ) ,
D = Δ + D g + D e + D s + D f .
Δ = D - D b .