Approximations for column effect in airplane wing spars
This 1927 NASA technical report, drawn from the NASA Technical Reports Server, gives engineering approximations for column effect in airplane wing spars, written for aircraft structural engineers. Its pictures are plain line graphs with fine grid paper, plotting moment ratios and load curves against angle or fraction, with labelled curves for overhang percentages. A designer could take from them the clean, restrained look of mid-century technical charts: thin black curves, dense grids and small serif labels.
