The "Potez 39" observation airplane (French) : an all-metal high-wing two-seat monoplane
This is a 1930 aeronautical technical report from NASA's Technical Reports Server describing the Potez 39, a French all-metal high-wing two-seat observation monoplane. Its pages are line drawings and photographs of aircraft structure: wing ribs, spars, fuselage frames and gussets, plus general arrangement drawings. A designer could take from them the clean, schematic way engineering drawings lay out members, joints and assemblies in plain black linework.
