Octant
date: label: date made
content: early 19th century
name: label: maker
content: Spencer & Co.
notes: label: Description
content: Octant with an ebony frame, reinforced brass index arm, and ivory name plate. The ivory scale is graduated every 20 minutes from -3° to +100° and read by vernier with tangent screw to single minutes of arc. There is a telescopic sight, four shades for the index mirror, and three shades for the horizon glass. The inscription reads "SPENCER & CO LONDON." The radius is about 11 inches. The U.S. Navy transferred this to the Smithsonian in 1930.
label: Description
content: Ref: Gloria Clifton, <i>Directory of British Scientific Instrument Makers 1550-1851</i> (London, 1895), p. 83.
label: Location
content: Currently not on view
place: label: place made
content: United Kingdom: England, London
setName: label: See more items in
content: Medicine and Science: Physical Sciences
label: See more items in
content: Measuring & Mapping
creditLine: label: Credit Line
content: U.S. Navy
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: PH.309887
label: catalog number
content: 309887
label: accession number
content: 110828
objectType: label: Object Name
content: octant
physicalDescription: label: Measurements
content: radius: 9 3/4 in; 24.765 cm
label: Measurements
content: overall: 4 5/8 in x 9 7/8 in x 11 1/4 in; 11.7475 cm x 25.0825 cm x 28.575 cm