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  1. See Baly, “Spectroscopy;” Kaycer, “Handbuch der Spektroskopie;” or any well-known text on Physical Optics.
  2. Cornu has shown that if there is a slight increase in the spacing of the rulings from one side of a concave grating to the other, the focus will not follow the true Rowland circle, but will deviate slightly from it.“Focal Anomalies,” C. R.,  116, p. 1215; 1893.
  3. Should the grating possess focal anomalies like those discussed by Cornu, the process of focusing will of course be more difficult and a fixed position for C will be better.
  4. Handbuch der Spektroskopie, Band I, 463.
  5. Anh. zu den Abhandlung d. Berlin. Akad. d. Wiss., 1902.Astrophysical Journal,  15, p. 235; 1902.
    [Crossref]

1902 (1)

Anh. zu den Abhandlung d. Berlin. Akad. d. Wiss., 1902.Astrophysical Journal,  15, p. 235; 1902.
[Crossref]

1893 (1)

Cornu has shown that if there is a slight increase in the spacing of the rulings from one side of a concave grating to the other, the focus will not follow the true Rowland circle, but will deviate slightly from it.“Focal Anomalies,” C. R.,  116, p. 1215; 1893.

Anh. zu den Abhandlung d. Berlin. Akad. d. Wiss. (1)

Anh. zu den Abhandlung d. Berlin. Akad. d. Wiss., 1902.Astrophysical Journal,  15, p. 235; 1902.
[Crossref]

C. R. (1)

Cornu has shown that if there is a slight increase in the spacing of the rulings from one side of a concave grating to the other, the focus will not follow the true Rowland circle, but will deviate slightly from it.“Focal Anomalies,” C. R.,  116, p. 1215; 1893.

Other (3)

Should the grating possess focal anomalies like those discussed by Cornu, the process of focusing will of course be more difficult and a fixed position for C will be better.

Handbuch der Spektroskopie, Band I, 463.

See Baly, “Spectroscopy;” Kaycer, “Handbuch der Spektroskopie;” or any well-known text on Physical Optics.

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Figures (2)

F. 1
F. 1

Optical Arrangement for Proposed Mounting

F. 2
F. 2

Position of Vertical Source

Tables (1)

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Table 1 (i = 45°) Comparison of Astigmatism

Equations (7)

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S = R ρ cos 2 θ ρ ( cos θ + cos i ) R cos 2 i
S = ρ cos 2 θ cos 2 i .
S = A cos 2 θ
c 2 = c 1 + ρ 1 ( 1 cos 2 i 2 / cos 2 i 1 )
cos 2 i ρ n cos 2 θ s = cos i n cos θ R 1 ρ n s = cos i n cos θ R
cos 2 i ρ cos 2 θ s = 0 1 ρ n s = 0
s s = ρ ( 1 cos 2 θ / cos 2 i )