Tensile Strength of Welded Steel Tubes : First Series of Experiments
A 1928 technical report from the NASA Technical Reports Server, a series of tests on welded steel tubes, prepared for engineers and researchers studying material strength. The first picture is a cross-section diagram of a tube joint with numbered parts and an arrow marking the axis of load, while the second is a plate of photographs of fractured tube ends beside charts of test results plotted as vertical bars. A designer could take from them the plain engineering-drawing style of numbered callouts, sectional line hatching, and the bar-chart layout for presenting comparative data.
