Experimental Studies of the Effective Width of Buckled Sheets
This is a 1936 NASA technical report on experimental studies of how wide a buckled sheet remains effective under load, written for aeronautical engineers and structural researchers. The pictures are plots of sheet-buckling theory against test data, plus a sketch of the clamped test rig, so a designer would take from them the graph styling and the sample-clamping arrangement rather than any imagery.
