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Diffraction Grating
From the collection of National Museum of American History. Free to download, adapt and use — no permission needed.
About this work
Charles A. Young, professor of astronomy at the College of New Jersey (later Princeton University), acquired this diffraction grating in 1877. The speculum metal plate measures 3 inches square, with the grating measuring 1.75 inch square. It is marked "Dec. 1, 1877" and "14,941 lines" and "8640 per inch" and "Manf. by D. C. Chapman with Mr. Rutherfurd's Engine. No. 175, 2 Ave. N. Y." Daniel C. Chapman was the mechanic who operated the ruling engine designed and built by Lewis M. Rutherfurd.
National Museum of American History’s own descriptionSubjects
Credit lineDiffraction Grating. 1877. Rutherfurd, Lewis Morris. National Museum of American History, Princeton University. CC0.
