Sextant
notes: label: Description
content: Sextant with a double brass frame of the sort introduced by Edward Troughton in London in 1788. The silvered scale is graduated every 10 minutes from -5° to +155° and read by vernier with tangent screw and swinging magnifier to 10 seconds of arc. The "Riggs Brothers, Philadelphia" inscription came into use in 1865, and refers to a firm that sold instruments of this sort to American customers.
label: Location
content: Currently not on view
place: label: place sold
content: United States: Pennsylvania, Philadelphia
setName: label: See more items in
content: Medicine and Science: Physical Sciences
label: See more items in
content: Navigation
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content: Measuring & Mapping
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 1989.0010.01
label: catalog number
content: 1989.0010.01
label: accession number
content: 1989.0010
objectType: label: Object Name
content: sextant
physicalDescription: label: Physical Description
content: brass (overall material)
label: Physical Description
content: glass (overall material)
label: Physical Description
content: ebony (overall material)
label: Measurements
content: radius: 7 in; 17.78 cm
label: Measurements
content: overall in case: 5 1/4 in x 11 in x 10 1/2 in; 13.335 cm x 27.94 cm x 26.67 cm