David Shackman & Sons Sextant

Description
This instrument resembles the "Mate" sextant made by Henry Hughes & Son, Ltd., of London. It has a blackened brass frame, and a brass scale that is graduated every degree from -5° to +135° and read by drum micrometer to 30 minutes of arc. It was examined at the National Physical Laboratory at Teddington, England, in 1942.
The inscription reads "MADE IN ENGLAND FOR KELVIN & WILFRID O. WHITE Co. BOSTON & NEW YORK" and "PATENT APPLIED FOR" and "1775" and "DS&S." The DS&S insignia refers to David Shackman & Sons, the British firm that actually made this sextant. The referenced patent (GB556034), issued to Albert Shackman and Reuben Cyril Shackman in September 1943, describes details of the drum micrometer.
Ref: Kelvin & Wilfrid O. White Co., Nautical Instruments (Boston, 1940), p. 31.
Henry Hughes & Son, Ltd., Husun Navigational Instruments (London, 1939), p. 31.
M. V. Brewington, The Peabody Museum Collection of Navigating Instruments (Salem, 1963), p. 132.
Location
Currently not on view
Object Name
sextant
date made
ca 1942
dealer
Kelvin & Wilfrid O. White
maker
David Shackman & Sons
Measurements
case: 5 1/4 in x 11 in x 11 in; 13.335 cm x 27.94 cm x 27.94 cm
place made
United Kingdom: England
ID Number
PH*337006
catalog number
337006
accession number
1978.2282
subject
Measuring & Mapping
Navigation
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Medicine and Science: Physical Sciences
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Data Source
National Museum of American History, Kenneth E. Behring Center

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