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 two perpendicular level vials. 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.247913
label: catalog number
content: 247913
label: accession number
content: 47736
objectType: label: Object Name
content: Alidade (Telescopic)
physicalDescription: label: Measurements
content: base: 20 in; 50.8 cm
label: Measurements
content: telescope: 10 1/4 in; 26.035 cm
label: Measurements
content: overall: 8 9/16 in x 20 in x 4 in; 21.74875 cm x 50.8 cm x 10.16 cm