Comparison of weights of 17ST and steel tubular structural members used in aircraft construction
A 1931 NASA technical report comparing weights of 17ST aluminum alloy and steel tubular members for aircraft structures, aimed at engineers. Its single picture is a plain graph with grid lines plotting yield strength curves for Steel A, Steel D and Steel B against a ratio of tube dimensions, with handwritten-style labels and dashed and solid lines. A designer might take from it only a spare, technical chart style built on fine grid lines and dashed versus solid curve contrast.
