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References

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  1. C. A. Young, The Sun (D. Appleton-Century Company, Inc., New York), 1895 edition, p. 67.
  2. H. A. Rowland, Johns Hopkins University Circulars, No. 17 (1882); Encyclopaedia Britannica, “Diffraction gratings” (1902).

1882 (1)

H. A. Rowland, Johns Hopkins University Circulars, No. 17 (1882); Encyclopaedia Britannica, “Diffraction gratings” (1902).

Rowland, H. A.

H. A. Rowland, Johns Hopkins University Circulars, No. 17 (1882); Encyclopaedia Britannica, “Diffraction gratings” (1902).

Young, C. A.

C. A. Young, The Sun (D. Appleton-Century Company, Inc., New York), 1895 edition, p. 67.

Johns Hopkins University Circulars, No. 17 (1)

H. A. Rowland, Johns Hopkins University Circulars, No. 17 (1882); Encyclopaedia Britannica, “Diffraction gratings” (1902).

Other (1)

C. A. Young, The Sun (D. Appleton-Century Company, Inc., New York), 1895 edition, p. 67.

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Figures (5)

Fig. 4
Fig. 4

Photomicrograph of a speculum diffraction grating having very bright second order. Grating space=1/600 mm. Enlargement 1920×. An accidental scratch reveals the perspective of the rulings. Aberrations, especially at the top, illustrate the well-known difficulty of interpretation of such a structure in the absence of a geometrical test such as that given by the scratch. Photographed with 2-mm oil immersion apochromatic objective and ×18 compensating ocular. Vertical illuminator.

Fig. 5
Fig. 5

Photomicrograph of a grating ruled on heavy electrolytic film of silver on a rolled copper base. The matte silver was buffed before ruling. Wide side of groove inclined 2° to original plane. Grating space=1/30 mm. Enlargement 312×. For perspective a single groove was ruled across the grating with the same diamond. Curved contour in the cross ruling indicates distortion in wide sides of grooves. Order of progression is from right to left, i.e., steep side of diamond is toward unruled metal. Note imperfect burnish at shallow side of each groove. Oblique illumination through vertical illuminator. 5.5-mm achromatic objective ×10 compensating ocular.