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References

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  1. Medium quartz spectrograph, manufactured by the Bausch and Lomb Optical Company, Rochester, New York.
  2. F. Twyman and C. B. Allsopp, The Practice of Absorption Spectrophotometry (Adam Hilger, Ltd., London, 1934).
  3. Wallace R. Brode, Chemical Spectroscopy (John Wiley and Sons, Inc., New York, 1934).
  4. George R. Harrison, “Current advances in photographic photometry,” J. Opt. Soc. Am. 24, 59–72 (1934).
    [Crossref]
  5. F. Twyman, L. J. Spencer, and A. Harvey, “Rapid spectrophotometry with bi-multiple spectra and a new type of wedge cell,” Trans. Opt. Soc. (London) 33, 37–53 (1931).
    [Crossref]
  6. B. O’Brien, “A null method of photographic spectrophotometry with a spiral aperture sector disk,” J. Opt. Soc. Am. 22, 426A (1932).
  7. Sample is here used in a general sense; it may refer to a transparent solid or liquid, a solid reflecting body, or to a light source. Standard refers to the corresponding reference body—that is, air, or matched cell containing the solvent, a standard of reflectance, or a standard light source.
  8. George R. Harrison and E. P. Bentley, “An improved high speed recording photometer,” J. Opt. Soc. Am. 30, 290–294 (1940).
    [Crossref]
  9. J. H. Webb, “The relationship between reciprocity law failure and the intermittency effect in photographic exposure,” J. Opt. Soc. Am. 23, 157–169 (1933).
    [Crossref]
  10. The strict treatment would include the exponential term, exp (−μx), in the weighting function, where μ is the absorption coefficient for the radiation in the fused silica, and x is the instantaneous path length in the fused silica.
  11. A fortunate result of the rotation of the sample and standard surfaces is that the energy of the condensed radiation is distributed around an annulus of appreciable circumference.

1940 (1)

1934 (1)

1933 (1)

1932 (1)

B. O’Brien, “A null method of photographic spectrophotometry with a spiral aperture sector disk,” J. Opt. Soc. Am. 22, 426A (1932).

1931 (1)

F. Twyman, L. J. Spencer, and A. Harvey, “Rapid spectrophotometry with bi-multiple spectra and a new type of wedge cell,” Trans. Opt. Soc. (London) 33, 37–53 (1931).
[Crossref]

Allsopp, C. B.

F. Twyman and C. B. Allsopp, The Practice of Absorption Spectrophotometry (Adam Hilger, Ltd., London, 1934).

Bentley, E. P.

Brode, Wallace R.

Wallace R. Brode, Chemical Spectroscopy (John Wiley and Sons, Inc., New York, 1934).

Harrison, George R.

Harvey, A.

F. Twyman, L. J. Spencer, and A. Harvey, “Rapid spectrophotometry with bi-multiple spectra and a new type of wedge cell,” Trans. Opt. Soc. (London) 33, 37–53 (1931).
[Crossref]

O’Brien, B.

B. O’Brien, “A null method of photographic spectrophotometry with a spiral aperture sector disk,” J. Opt. Soc. Am. 22, 426A (1932).

Spencer, L. J.

F. Twyman, L. J. Spencer, and A. Harvey, “Rapid spectrophotometry with bi-multiple spectra and a new type of wedge cell,” Trans. Opt. Soc. (London) 33, 37–53 (1931).
[Crossref]

Twyman, F.

F. Twyman, L. J. Spencer, and A. Harvey, “Rapid spectrophotometry with bi-multiple spectra and a new type of wedge cell,” Trans. Opt. Soc. (London) 33, 37–53 (1931).
[Crossref]

F. Twyman and C. B. Allsopp, The Practice of Absorption Spectrophotometry (Adam Hilger, Ltd., London, 1934).

Webb, J. H.

J. Opt. Soc. Am. (4)

Trans. Opt. Soc. (London) (1)

F. Twyman, L. J. Spencer, and A. Harvey, “Rapid spectrophotometry with bi-multiple spectra and a new type of wedge cell,” Trans. Opt. Soc. (London) 33, 37–53 (1931).
[Crossref]

Other (6)

Medium quartz spectrograph, manufactured by the Bausch and Lomb Optical Company, Rochester, New York.

F. Twyman and C. B. Allsopp, The Practice of Absorption Spectrophotometry (Adam Hilger, Ltd., London, 1934).

Wallace R. Brode, Chemical Spectroscopy (John Wiley and Sons, Inc., New York, 1934).

The strict treatment would include the exponential term, exp (−μx), in the weighting function, where μ is the absorption coefficient for the radiation in the fused silica, and x is the instantaneous path length in the fused silica.

A fortunate result of the rotation of the sample and standard surfaces is that the energy of the condensed radiation is distributed around an annulus of appreciable circumference.

Sample is here used in a general sense; it may refer to a transparent solid or liquid, a solid reflecting body, or to a light source. Standard refers to the corresponding reference body—that is, air, or matched cell containing the solvent, a standard of reflectance, or a standard light source.

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Figures (8)

Fig. 1
Fig. 1

Schematic side view of the photometer, showing the relationship of principal parts.

Fig. 2
Fig. 2

On-axis views of the drives for the oscillating box and the masking grate.

Fig. 3
Fig. 3

Disposition of the absorption cells, masking grate, and the spectrograph slit at the extrema of the oscillatory motion.

Fig. 4
Fig. 4

The sector disk.

Fig. 5
Fig. 5

The multistep sector photometer mounted on the spectrograph.

Fig. 6
Fig. 6

Some of the auxiliary devices used with the photometer: deviating prisms, disk for spectral reflectance, and absorption cells. For comparison of size, a 6-inch rule is included in the photograph.

Fig. 7
Fig. 7

Arrangement for determining spectral absorption of filters or cells that are too large for placement in the oscillating box of the photometer.

Fig. 8
Fig. 8

Schematic drawing of the arrangement for determining spectral reflectance.