Vernier Compass with Telescope
name: label: maker
content: W. & L. E. Gurley
notes: label: Description
content: The inscription on this compass reads "W. & L. E. Gurley, Troy, N. Y." Gurley described this as a "Pocket Railroad Compass with Telescope." The form, with the folding sights offset so that the telescope is aligned with the north south line, was made between 1887 and 1920. The rim is graduated to 30 minutes, and numbered in quadrants from north and south. The outside of the box has a variation arc that extends ± 35 degrees, and that reads by folded vernier to 5 minutes. New, it cost $58.
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., 1904), p. 140.
label: Description
content: William H. Skerritt, <i>Catalog of the Charles E. Smart Collection of Antique Surveying Instruments</i> (Troy, N.Y., 1996), pp. 36-39.
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
label: See more items in
content: Measuring & Mapping
publisher: label: Related Publication
content: W. & L. E. Gurley. Manual of the Prinicipal Instruments Used in American Engineering and Surveying; 37th Edition
label: Related Publication
content: Skerritt, William H.. Catalog of the Charles E. Smart Collection of Antique Surveying Instruments
creditLine: label: Credit Line
content: Robert V. R. Reynolds
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: PH.312755.01
label: accession number
content: 165452
label: catalog number
content: 312755.01
objectType: label: Object Name
content: compass (pocket with telescope)
label: Object Type
content: Patent Model
physicalDescription: label: Measurements
content: overall: 5 3/4 in; 14.605 cm
label: Measurements
content: needle: 4 1/2 in; 11.43 cm
label: Measurements
content: telescope: 8 3/4 in; 22.225 cm
label: Measurements
content: vertical circle: 3 1/2 in; 8.89 cm
label: Measurements
content: overall in case: 5 in x 10 3/8 in x 7 1/8 in; 12.7 cm x 26.3525 cm x 18.0975 cm