Tests on Built-Up Airplane Struts Having Initial Tension in Outside Fibers
This is a 1923 NACA-era technical report from the NASA Technical Reports Server, presenting laboratory tests on built-up airplane struts with pre-stressed outer fibres, written for aeronautical engineers. The four pictures are mostly line-drawn test setups: curved laminated strut sections, loading diagrams with downward arrows, and a sepia photograph of wooden strut stacks beside a testing machine. A designer could take from them the crisp schematic style of engineering diagrams, with simple labelled figures and arrows set on plain cream paper.
