Telescopic Alidade
notes: label: Description
content: This alidade has a telescope with a level mounted above, and a vertical circle that is silvered, graduated to 30 minutes, and read by vernier to single minutes. The base has six large circular holes, and a circular level vial. An inscription reads "U.S.G.S. No 11." The U.S. Geological Survey transferred it to the Smithsonian in 1907, describing it as a "preliminary type" of alidade devised for the Survey about 1890.
label: Location
content: Currently not on view
setName: label: See more items in
content: Medicine and Science: Physical Sciences
label: See more items in
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.247914
label: catalog number
content: 247914
label: accession number
content: 47736
objectType: label: Object Name
content: Alidade (Telescopic)
physicalDescription: label: Measurements
content: base: 26 in; 66.04 cm
label: Measurements
content: telescope: 11 1/2 in; 29.21 cm
label: Measurements
content: overall: 8 13/16 in x 26 in x 3 1/2 in; 22.38375 cm x 66.04 cm x 8.89 cm