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  1. ZS f. Physik,  61, 700–702; 1930.
    [CrossRef]
  2. The suggestion to use an electromagnet for this purpose was made by Mr. H. S. Roberts of this Laboratory.
  3. Carnegie Institution of Washington Year Book No. 29, p. 178, 1929–1930.
  4. Recently Dr. J. A. Anderson of Mt. Wilson Observatory has substituted for the single slit a multiple slit, such as a half-tone screen ruled in one direction only. He thereby increases the intensity of illumination over the single slit method and obtains a degree of fusion that is satisfactory in many cases. The ruled grating may also be inserted either directly below the objective or in the plane of the exit pupil above the eyepiece.
  5. A detailed description of this arrangement is given in F. E. Wright, A polarization photometer eyepiece. J.O.S.A. & R.S.I.,  14, 339–341, 1927.
    [CrossRef]

1930 (1)

ZS f. Physik,  61, 700–702; 1930.
[CrossRef]

1927 (1)

A detailed description of this arrangement is given in F. E. Wright, A polarization photometer eyepiece. J.O.S.A. & R.S.I.,  14, 339–341, 1927.
[CrossRef]

Wright, F. E.

A detailed description of this arrangement is given in F. E. Wright, A polarization photometer eyepiece. J.O.S.A. & R.S.I.,  14, 339–341, 1927.
[CrossRef]

Carnegie Institution of Washington Year Book (1)

Carnegie Institution of Washington Year Book No. 29, p. 178, 1929–1930.

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

A detailed description of this arrangement is given in F. E. Wright, A polarization photometer eyepiece. J.O.S.A. & R.S.I.,  14, 339–341, 1927.
[CrossRef]

ZS f. Physik (1)

ZS f. Physik,  61, 700–702; 1930.
[CrossRef]

Other (2)

The suggestion to use an electromagnet for this purpose was made by Mr. H. S. Roberts of this Laboratory.

Recently Dr. J. A. Anderson of Mt. Wilson Observatory has substituted for the single slit a multiple slit, such as a half-tone screen ruled in one direction only. He thereby increases the intensity of illumination over the single slit method and obtains a degree of fusion that is satisfactory in many cases. The ruled grating may also be inserted either directly below the objective or in the plane of the exit pupil above the eyepiece.

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Figures (5)

F. 1
F. 1

Sectional views of glass cube mounted on an elastic steel spring driven by an electromagnet on an alternating current to produce rapid oscillations in the image of a spectrogram.

F. 2
F. 2

Photomicrographs (magnification 23 X) of an iron-arc spectrogram to show the effects produced by different methods for eliminating photographic plate graininess from the spectral lines. Fig. 2A is a copy of the unmodified spectrogram. The remaining photomicrographs illustrate the character of the fusion produced by: the vibrating glass cube (Fig. 2B); the cylindrical lens (Fig. 2C); the tilted glass plates (Fig. 2D); two slit diaphragms of different apertures (Figs. 2E, 2F); the Wollaston prism (Fig. 2G); dark ground illumination (Fig. 2H).

F. 3
F. 3

Section of apparatus for rocking glass cube to produce vibrating image.

F. 4
F. 4

Sections of two different prism arrangements for obtaining two superposed but slightly displaced spectral image lines.

F. 5
F. 5

Fresnel prism arrangement for obtaining two sharp dividing lines between two sets of adjoining spectral lines. Fig. 5 A. Truncated Fresnel prism arrangement for obtaining two sharp dividing lines between a central set of spectral lines and two outer sets of comparison spectral lines.