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Diffraction Grating
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Diffraction Grating

Rutherfurd, Lewis Morris · 1878 · overall: 77 mm x 77 mm x 8 mm; 3 1/32 in x 3 1/32 in x 5/16 in

From the collection of National Museum of American History. Free to download, adapt and use — no permission needed.

About this work

Charles A. Young, the professor of astronomy at the College of New Jersey (later Princeton University), acquired this diffraction grating in 1878. The speculum metal plate measures 3 inches square overall, with the grating measuring 1.75 inch square. It is marked: "May 28, 1878" and "16,560 spaces" and "8648 per inch" and "Manf. by D. C. Chapman with Mr. Rutherfurd's Engine." Daniel C. Chapman was the mechanic who operated the ruling engine designed by Lewis M. Rutherfurd.

National Museum of American History’s own description
Subjects
Diffraction Grating
Credit lineDiffraction Grating. 1878. Rutherfurd, Lewis Morris. National Museum of American History. CC0.
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