[French technical drawings, of a plane table with telescopic alidade, 176-. 5 drawings on 3 sheets, ink and colour wash. Drawings have ms. titles and detail the constituent parts of a plane-table with telescope alidade. With ms. specification (4p in French), and ms. letter, 1766 Sept. 3, Brest to M. Dajot, Douai / Filley, indication that the instrument could be made by Canivet of Paris (4p in French)] French technical drawings