MacDonald, Alexander Forsyth, 1897-1965 · Port Credit, Ont. : Aviation Service Corporation · leaf 89
his case 56° in one direction, or236° in the opposite direction. Note: The figures 10 and 20 marked on the parallel linesare used by engineers to measure the slope of an angle, but haveno significance to the Pilot-Navigator. RULER AND DIVIDERS In addition to the Circular Slide-rule and… … fig. 4 J. Thr Douglas Protrartm Radio 85 t^^MM ^ - *» Radio is the modern magic genie that creates invisibletraffic arteries in the skies, whose voice reaches out tothe airman in the overcast from the unseen world below—his guide to the weather that lies along his route, tothe traffic pattern plan…
Airplanes
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