Alidade
notes: label: Description
content: This alidade consists of a cherry bar with folding brass sights located near either end and centered on one beveled edge. The other beveled edge is graduated to quarter inches. The U.S. Geological Survey transferred it to the Smithsonian in 1907.
label: Location
content: Currently not on view
setName: label: See more items in
content: Medicine and Science: Physical Sciences
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content: Surveying and Geodesy
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content: Measuring & Mapping
creditLine: label: Credit Line
content: U.S. Geological Survey
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: PH.247915
label: catalog number
content: 247915
label: accession number
content: 47736
objectType: label: Object Name
content: Alidade
physicalDescription: label: Physical Description
content: wood (overall material)
label: Physical Description
content: brass (overall material)
label: Measurements
content: overall: 2 3/4 in x 23 in; 6.985 cm x 58.42 cm
label: Measurements
content: overall arms folded down: 11/16 in x 23 in x 1 7/8 in; 1.74625 cm x 58.42 cm x 4.7625 cm