Traffic airships with special reference to economy
A 1921 technical report from the NASA Technical Reports Server, a scanned government-style study of airship economics, prepared for engineers and aviation planners considering commercial traffic airships. The pictures are plain engineering charts and graphs: flight distance and fuel-consumption nomograms, a propeller efficiency curve, and a gas volume altitude plot, all in black ink on white, offering a designer clean line-chart and graph-paper references.
