Diffraction Grating

Diffraction Grating

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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.
Ref: D. J. Warner, "Lewis M. Rutherfurd: Pioneer Astronomical Photographer and Spectroscopist," Technology and Culture 12 (1971): 190-216.
Currently not on view
Object Name
diffraction grating
date made
Rutherfurd, Lewis Morris
place made
United States: New York
overall: 73 mm x 73 mm x 7 mm; 2 7/8 in x 2 7/8 in x 9/32 in
overall: 3 3/4 in x 4 11/16 in x 1/2 in; 9.525 cm x 11.90625 cm x 1.27 cm
ID Number
accession number
catalog number
Credit Line
Princeton University
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Medicine and Science: Physical Sciences
Science & Mathematics
Data Source
National Museum of American History
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