The frame of this instrument is rosewood, while the arcs, cross bar, and sights are boxwood. The boxwood inset is inscribed "Made.by.John.Holbeche.for Capt Joseph.Swan.1738." John Holbeche advertised an Instrument Maker & Ship-Chandler at the Corner of the Hermitage in London.
Ref: Gloria Clifton, Directory of British Scientific Instrument Makers 1550-1851 (London, 1995), p. 138.
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