Box Sextant
date: label: date made
content: around 1900
name: label: associated person
content: Keuffel, William J. D.
label: associated person
content: Esser, Herman
label: dealer
content: Keuffel & Esser 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 was probably made around 1900. New, it cost $40. The silvered scale is graduated every 30 minutes from -5° to +150° and read by vernier with swinging magnifier to single minutes of arc. The inscription reads "KEUFFEL & ESSER CO. N.Y. MADE IN ENGLAND."
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: Description
content: Keuffel & Esser, <i>Catalogue</i> (New York, 1906), p. 415.
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: University of Missouri-Columbia
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: PH.333639
label: accession number
content: 300659
label: catalog number
content: 333639
objectType: label: Object Name
content: box sextant
physicalDescription: label: Measurements
content: overall: 3 1/4 in; 8.255 cm
label: Measurements
content: overall: 4 1/4 in x 3 1/2 in x 1 7/8 in; 10.795 cm x 8.89 cm x 4.7625 cm