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Pettyt, Thomas (d. 1556), surveyor and military engineer, is of unknown origins; all that is known of his family is that an Edmund Pettyt who was at Calais while Thomas was surveyor there may well have been related. Thomas appears first in 1542 'riding to ...


Watson, David (1713?–1761), military surveyor and engineer, was the son of Thomas Watson of Muirhouse, Scotland. He had a brother, John, and a sister, Margaret. Appointed ensign in Colonel Middleton's regiment, later the 25th foot, on 10 July 1725, he was at ...


David Watson (1713?–1761) by Andrea Soldi, 1756 in the collection of the Dundas-Bekker Family; photograph courtesy the Scottish National Portrait Gallery