Procedure for Determining Speed and Climbing Performance of Airships
This is a 1936 NACA technical note, issued by the National Advisory Committee for Aeronautics, setting out a procedure for measuring airship speed and climb rate. Its pictures are plain engineering figures: a grid chart of air pressure against altitude, a small graph of velocity ratio, and a photograph of a bugle-shaped air-speed head mounted on a boom with a fin assembly, offering a designer a sober diagram vocabulary of graph paper, tidy axis labels and cream-toned technical pages.
