Telescopic Alidade
name: label: maker
content: W. & L. E. Gurley
notes: label: Description
content: Gurley began offering telescopic alidades in 1884, explaining that “This instrument, which has been so largely employed abroad in topography and map drawing, is now fast coming into use in our own country, especially in colleges and schools where the study of surveying is pursued.” This example belonged to Gettysburg College and is marked “W. & L. E. GURLEY TROY, N.Y.” The lack of serial number indicates that it was made before 1908. It has an erecting telescope with level above, and a vertical circle that is graduated to 30 minutes and read by vernier to single minutes. There is also a box compass with level vials, a plumbing bar, and a plumb bob.
label: Description
content: Ref: W. & L. E. Gurley, <i>A Manual of the Principal Instruments Used in American Engineering and Surveying</i> (Troy, N.Y., 1893), pp. 215-224.
label: Location
content: Currently not on view
place: label: place made
content: United States: New York, Troy
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
publisher: label: Related Publication
content: W. & L. E. Gurley. Manual of the Prinicipal Instruments Used in American Engineering and Surveying; 30th Edition
creditLine: label: Credit Line
content: Gettysburg College
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 1982.0104.05
label: accession number
content: 1982.0104
label: catalog number
content: 1982.0104.05
objectType: label: Object Name
content: alidade (telescopic)
physicalDescription: label: Measurements
content: overall in case: 6 1/4 in x 21 1/16 in x 10 1/4 in; 15.875 cm x 53.49875 cm x 26.035 cm