Charts for checking the stability of plane systems of rods
This is a 1937 NACA technical memorandum, No. 837, issued by the National Advisory Committee for Aeronautics and held in the NASA Technical Reports Server, intended for aeronautical engineers checking the buckling stability of plane frameworks of rods. Its pictures are dense engineering nomograms: one square chart of curved isoline families on a gridded field with labelled tension and compression zones, and a rotated companion chart with radiating curves and axis captions. A designer might take the fine radiating line families and the precise lettered grid as examples of technical diagram structure and rhythm.
