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Heath and Wing theodolite sold for £10,000 by Tennants.

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This theodolite was probably made in the third quarter of the 18th century, its basic form deriving from the design that Thomas Heath had introduced as early as 1725.

A trade catalogue published in 1765 titled Mathematical, Philosophical, and Optical Instruments Made and Sold by Heath and Wing, describes similar instruments under the title ‘Theodolites of the latest Improvements by T Heath’.

Heath trained several notable apprentices, his last protégé being Tycho Wing, whom he took into partnership in 1753. The business was based near Exeter-Exchange in the Strand, London.