W. H. Welch Sextant

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."
Currently not on view
Object Name
date made
ca 1929-1963
Welch Scientific Company
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
place made
United States: Illinois, Chicago
ID Number
catalog number
accession number
Measuring & Mapping
See more items in
Medicine and Science: Physical Sciences
Data Source
National Museum of American History, Kenneth E. Behring Center

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