Diffraction Grating
date: label: date made
content: 1929
notes: label: Description
content: Robert William Wood (1868-1955) succeeded Henry A. Rowland as professor of physics at Johns Hopkins University; and under his leadership, Rowland’s ruling engine continued to produce diffraction gratings. This example came from the Smithsonian Astrophysical Observatory. Its base is speculum metal. An inscription reads “Ruled Oct. 1, 1929 / concentrates at 16-17 order λ5461 or 8.5-9μ / 1312 lines per inch / R. W. Wood & H. M. O’Bryan.”
label: Description
content: Ref: John Strong, “The Johns Hopkins University and Diffraction Gratings,” <i>Journal of the Optical Society of America</i> 50 (1960): 1148-1152.
label: Location
content: Currently not on view
place: label: place made
content: United States: Maryland, Baltimore
setName: label: See more items in
content: Medicine and Science: Physical Sciences
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: PH.327696
label: catalog number
content: 327696
label: accession number
content: 268220
objectType: label: Object Name
content: diffraction grating
physicalDescription: label: Measurements
content: overall, case: 1 3/4 in x 6 in x 6 in; 4.445 cm x 15.24 cm x 15.24 cm