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Three cylindrically-shaped tensile samples, each 12 mm in diameter. were machined from three different spherically-shaped single crystals. Samples A and B yielded with applied loads of 77.1 and 56 N, respectively. Does the difference in load level indicate that the crystals possessed different strength levels? Also, what load level would be necessary to cause Sample C to deform and what is the controlling stress for yielding? The fact that different load levels were needed to cause yielding in Samples A and B may indicate that the materials in the two rods possessed different properties. Then, again, the materials may have been identical but instead, machined at arbitrarily different orientations from the three spherically shaped single crystals. To resolve this issue, additional information is needed. Specifically, it is necessary to determine the crystallographic orientation of the three single crystals, relative to their respective loading directions. X-ray diffraction studies determined that the angles between the tensile axis and both slip plane normals and slip directions are P Sample A Sample B Sample C 70.5 64 13 29 23 78 77.1 56 2