The writer has in various places published results of tests on the coefficient of rigidity of drawn tungsten wires. The latest results indicated clearly that in a series of wires drawn down from the same original stock the coefficient of simple rigidity progressively increased as the diameters of the wires decreased. For example, the value of "n" ranged in the case of two extremes of five such wires from 14.15xl011 to 15.10x1011 dynes per square cm., for corresponding radii of 0.0227 cm., and 0.00240 cm. The hypothesis was put forth at that time that a change in the crystal structure which was limited to the surface, and which yielded a greater rigidity for the wire would account for the results. This, because as the wires become progressively smaller the effect of the surface would become more and more pronounced.
Proceedings of the Iowa Academy of Science
©1921 Iowa Academy of Science, Inc.
Sieg, L. P.
"The Effect of Drawing on the Crystal Structure of Tungsten Wires,"
Proceedings of the Iowa Academy of Science, 28(1), 95-97.
Available at: https://scholarworks.uni.edu/pias/vol28/iss1/18