An English Altitude Theodolite, William Wilton, Cornwall, circa 1830, circular plate with extended arms to carry open sights, in the centre is a silvered compass, underneath a glazed case, flanked by two spirit levels and a scale divided into quadrants of 0-90, corresponding with each point of the compass, needle locking device, and a raised scale of 0-360, glass cover. The semicircle above is engraved on the arc with 0-90-0 which is engraved to its outer edge. An index arm is mounted at the centre of the semi-circle, with vernier and carrying the sighting arm with a bubble level mounted centrally between the sights. Catalogue note: William Wilton is listed as an horologist and instrument maker at St. Day, Cornwall, between 1830 - 1851, and at Market place, Camborne from 1852 - 1856., an identical instrument by William Wilton was displayed in the Captain Cooks Exhibition at the Science Museum, Melbourne
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- Circa - A Latin term meaning 'about', often used in the antique trade to give an approximate date for the piece, usually considered to be five years on either side of the circa year. Thus, circa 1900 means the piece was made about 1900, probably between 1895 and 1905. The expression is sometimes abbreviated to c.1900.
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