Experimental analysis of multicell wings by means of plastic models
This is a 1955 NASA technical report, issued by NASA's aeronautics research staff for engineers, on experimental stress and deflection testing of multicell wing structures using plastic models. Its pictures are plain line diagrams of delta-wing box sections with grid overlays, stress and deflection curves plotted against chord, and captions for figures 3 and 4. A designer might take from them the simple technical-diagram style of grids, curves and labelled axes.
