Lot 251
2 vols. FERRI, Antonio, Elements of Aerodynamics of Supersonic Flows, New York: Macmillan 1949, 8vo, 433 pp, bound in contemporary blue cloth, silver lettering, fold out chart within an envelope on back board, Vickers-Armstrongs stamp to title and Barnes Wallis handwritten note "received 14.vi.49" to title page. POPE, Alan. Aerodynamics of Supersonic Flight an Introduction, London: Pitman Publishing Corp. 1950, 8vo, 184pp, bound in blue and gilt cloth, (spine in poor condition), Vickers-Armstrongs stamp to title page, together with a facsimile of a German article on wing design dated 1957  £50-70