CHAPMAN, Frederik Henrik af. A Treatise concerning the true method of finding the proper area of the sails for ships of the line, and from thence the length of masts and yards, London: Society for the Improvement of Naval Architecture, January 1794, 8°, FIRST EDITION IN ENGLISH, xv + [17]-76pp., one folding engraved plate (light spotting throughout, occasional marginal soiling), contemporary half vellum and boards (inner hinges strengthened with adhesive tape, front joints cracked, rubbed) ownership inscription of Sam Reid, 1816, to title.