Navigation, Magnetism and Deviation of the Compass A manual for the use of Aerial Navigators
London: Royal Naval Air Service-Air Department, 1917. Octavo, blue papered-boards, iv, 102 pp., illustrated with diagrams, figures, and three folding plates, one index, four maps after index. Slight tear on one leaf with no loss of text, notes written in pencil on the margin, previous owner's inscription on inner front..... More