In the O/90” case, many tensile specimens intended for other purposes were subjected to virgin stiffness (modulus) checks; those data are included in the Table 3.1 average. Poisson’s ratio values came from special tests on specimens with 3.2~nungage-length two-gage rosettes on both faces. The compression specimens are also described in Ref. 1, as are the Iosipescu shear specimens that were used. Strain gages were used for strain measurement in both of the latter two types of tests.