Surveyor's Vernier Compass
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E. Gurley"], "topic": ["Geodesy", "Surveying"], "place": ["New York", "United States", "Troy"], "online_media_type": ["Images"]}, "freetext": {"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"}], "identifier": [{"label": "ID Number", "content": "PH.247917"}, {"label": "catalog number", "content": "247917"}, {"label": "accession number", "content": "47736"}], "notes": [{"label": "Description", "content": "Gurley described this as \"a most excellent and portable little instrument,\" noting that it \"is especially useful for the surveyor of government lands.\" New, it cost $21. The rim is graduated to 30 minutes. The right side of the face is graduated to degrees, and numbered every 10 degrees from west to north, and from west to south. The outside of the box has a variation arc that extends \u00c2\u00b1 20 degrees, and that reads by folded vernier to 5 minutes. The U.S. Geological Survey, was established in 1879, and transferred this example it to the Smithsonian in 1907."}, {"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., 1878), p. 138."}, {"label": "Location", "content": "Currently not on view"}], "creditLine": [{"label": "Credit Line", "content": "U.S. Geological Survey"}], "name": [{"label": "maker", "content": "W. & L. E. Gurley"}], "publisher": [{"label": "Related Publication", "content": "W. & L. E. Gurley. Manual of the Prinicipal Instruments Used in American Engineering and Surveying; 23rd Edition"}], "place": [{"label": "place made", "content": "United States: New York, Troy"}], "physicalDescription": [{"label": "Measurements", "content": "overall: 4 3/8 in; 11.1125 cm"}, {"label": "Measurements", "content": "needle: 3 1/2 in; 8.89 cm"}, {"label": "Measurements", "content": "overall: 6 in x 4 3/4 in x 4 7/8 in; 15.24 cm x 12.065 cm x 12.3825 cm"}], "dataSource": [{"label": "Data Source", "content": "National Museum of American History"}], "objectType": [{"label": "Object Name", "content": "Sighting Compass"}, {"label": "Object Type", "content": "Patent Model"}]}}, "url": "edanmdm:nmah_761557", "hash": "49ba8896b8f337f098a91a97711d88d55542e6dc", "docSignature": "fcb2e13067e273804005cc6805d1eea9", "timestamp": 1663782597, "lastTimeUpdated": 1655973882, "title": "Surveyor's Vernier Compass"}