Box Sextant
date: label: date made
content: after 1912
name: label: dealer
content: Warren-Knight Co.
notes: label: Description
content: A box (or pocket) sextant works like a traditional sextant, but here the mechanism is enclosed in a brass box of about 3 inches diameter. William Jones, a leading instrument maker in London, introduced the form in 1797.
label: Description
content: This example probably belonged to Llewellyn N. Edwards (1874-1952), a structural engineer. It has a silvered scale graduated every 30 minutes from -5° to +150° and read by vernier with swinging magnifier to single minutes of arc. The inscription reads "WARREN-KNIGHT CO. PHILADELPHIA. MADE IN ENGLAND." Warren-Knight began in business in 1912.
label: Description
content: Ref: William Jones, "Description of a New Pocket Box Sextant," in George Adams, Geometrical and Graphical Essays, 2nd ed. by William Jones, (London, 1797), pp. 283-285.
label: Location
content: Currently not on view
place: label: place made
content: United Kingdom: England
setName: label: See more items in
content: Medicine and Science: Physical Sciences
label: See more items in
content: Navigation
label: See more items in
content: Measuring & Mapping
creditLine: label: Credit Line
content: Bequest of Carolyn H. Edwards
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: PH.333796
label: catalog number
content: 333796
label: accession number
content: 296611
objectType: label: Object Name
content: box sextant
physicalDescription: label: Measurements
content: overall: 3 1/4 in; 8.255 cm
label: Measurements
content: overall: 4 3/8 in x 4 in x 2 in; 11.1125 cm x 10.16 cm x 5.08 cm