Temperature Coefficient of the Modulus of Rigidity of Aircraft Instrument Diaphragm and Spring Materials
A 1931 technical report from the National Advisory Committee for Aeronautics, preserved through the NASA Technical Reports Server, written for engineers measuring how the rigidity of diaphragm and spring metals changes with temperature for aircraft instruments. The pictures are plain engineering graphs of modulus against temperature and stress, with a photograph of a laboratory test rig of coiled springs on a bench, offering a designer little beyond the restrained look of period scientific charts.
