Diffraction Grating
date: label: date made
content: 1886
name: label: maker
content: Rowland, Henry A.
label: maker
content: Brashear, John A.
notes: label: Description
content: This concave metal grating probably belonged to Samuel Pierpont Langley, director of the Allegheny Observatory and professor of astronomy at the Western University of Pennsylvania (now the University of Pittsburgh). It probably came to Washington in 1887 when Langley became the third Secretary of the Smithsonian Institution.
label: Description
content: The inscription reads "plate polished and corrected by J. A. Brashear Pittsburgh, Mar. 1886 Radius 64 Ruled by Schneider on Rowland engine Johns Hopkins University April 1886 - lines to in temp-".
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
label: See more items in
content: Science & Mathematics
creditLine: label: Credit Line
content: Smithsonian Astrophysical Observatory
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: PH.316718
label: catalog number
content: 316718
label: accession number
content: 227592
objectType: label: Object Name
content: diffraction grating
physicalDescription: label: Measurements
content: overall: 4 3/4 in x 6 3/4 in x 7 3/4 in; 12.065 cm x 17.145 cm x 19.685 cm
label: Measurements
content: overall: 4 3/4 in x 6 3/4 in x 7 3/4 in; 12.065 cm x 17.145 cm x 19.685 cm