Sextant
date: label: date made
content: ca 1929-1963
name: label: maker
content: Welch Scientific Company
notes: label: Description
content: Short discussions of the sextant began appearing in physics texts in the 1880s, and inexpensive sextants suitable for pedagogical purposes followed soon thereafter. This die-cast metal instrument is of that sort. Welch catalogs describe it as a "convenient demonstration model of an engineer’s or a mariner’s sextant." The scale is graduated every 30' from 0° to 120° and read by vernier to six minutes of arc. A small bubble level is mounted on the sighting tube. The inscription reads "W. M. WELCH SCIENTIFIC COMPANY (/) WELCH (/) ESTABLISHED 1880 (/) 1515 SEDGWICK ST. CHICAGO. U.S.A."
label: Description
content: Ref: W. M. Welch Scientific Company, <i>Catalog. Scientific Apparatus</i> (Chicago, 1929-1963).
label: Description
content: W. M. Welch Scientific Company, "Instructions for the Use of No. 3536 Sextant Model."
label: Location
content: Currently not on view
place: label: place made
content: United States: Illinois, Chicago
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: 2004.0197.01
label: catalog number
content: 2004.0197.01
label: accession number
content: 2004.0197
objectType: label: Object Name
content: sextant
physicalDescription: label: Measurements
content: overall: 2 1/4 in x 7 7/8 in x 7 1/4 in; 5.715 cm x 20.0025 cm x 18.415 cm
label: Measurements
content: overall: 2 1/4 in x 8 in x 7 1/4 in; 5.715 cm x 20.32 cm x 18.415 cm