EULER, Leonhard. The True Principles of Gunnery investigated and explained, London: J. Nourse, 1777, 4°, FIRST ENGLISH EDITION, 5 folding engraved plates, one folding table, wide margins (outer margin of title and first few leaves lightly browned), contemporary tree calf, gilt armorial of the Inner Temple Library to covers (recased and rebacked with new endpapers, worn).