Rutherfurd Diffraction Grating

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.
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
overall: 77 mm x 77 mm x 8 mm; 3 1/32 in x 3 1/32 in x 5/16 in
place made
United States: New York
ID Number
accession number
catalog number
Science & Mathematics
See more items in
Medicine and Science: Physical Sciences
Data Source
National Museum of American History, Kenneth E. Behring Center

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