Diffraction Grating
date: label: date made
content: 1878
name: label: maker
content: Rutherfurd, Lewis Morris
notes: label: Description
content: 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.
label: Description
content: Ref. D. J. Warner, "Lewis M. Rutherfurd: Pioneer Astronomical Photographer and Spectroscopist," <i>Technology and Culture</i> 12 (1971): 190-216.
label: Location
content: Currently not on view
place: label: place made
content: United States: New York
setName: label: See more items in
content: Medicine and Science: Physical Sciences
label: See more items in
content: Science & Mathematics
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: PH.330707
label: accession number
content: 299612
label: catalog number
content: 330707
objectType: label: Object Name
content: Diffraction Grating
physicalDescription: label: Measurements
content: overall: 77 mm x 77 mm x 8 mm; 3 1/32 in x 3 1/32 in x 5/16 in
label: Measurements
content: overall: 4 in x 4 in x 1 in; 10.16 cm x 10.16 cm x 2.54 cm