Sextant

Description:

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."

Ref: W. M. Welch Scientific Company, Catalog. Scientific Apparatus (Chicago, 1929-1963).

W. M. Welch Scientific Company, "Instructions for the Use of No. 3536 Sextant Model."

Date Made: ca 1929-1963

Maker: Welch Scientific Company

Location: Currently not on view

Place Made: United States: Illinois, Chicago

See more items in: Medicine and Science: Physical Sciences, Navigation, Measuring & Mapping

Exhibition:

Exhibition Location:

Data Source: National Museum of American History

Id Number: 2004.0197.01Catalog Number: 2004.0197.01Accession Number: 2004.0197

Object Name: sextant

Measurements: 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 cmoverall: 2 1/4 in x 8 in x 7 1/4 in; 5.715 cm x 20.32 cm x 18.415 cm

Guid: http://n2t.net/ark:/65665/ng49ca746ab-81b7-704b-e053-15f76fa0b4fa

Record Id: nmah_1276510

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