Resistivity of Single Crystal Zinc

Measurements of specific resistance as a function of orientation check the Voigt-Thomson symmetry relation accurately for crystals made from Kahlbaum's best zinc. The principal resisitivities are: ${\rho }_{\parallel }={6.20}^2$ and ${\rho }_{\perp }={5.86}^8\times {10}^{-6\mathrm{}}$ ohms/${\mathrm{cm}}^3$, with the ratio $\frac{{\rho }_{\parallel }}{{\rho }_{\perp }}=1.057\mathrm{}$. For "spectroscopically pure" zinc the majority of the crystals yield consistently the same value of $\frac{{\rho }_{\parallel }}{{\rho }_{\perp }}$, with ${\rho }_{\parallel }$ and ${\rho }_{\perp }$ each about 0.6 percent lower than for the Kahlbaum zinc crystals. A few crystals of the S.P. zinc give anomalous results of a type previously found by Bridgman. The disagreement between the writer's values (particularly of ${\rho }_{\parallel }$ and $\frac{{\rho }_{\parallel }}{{\rho }_{\perp }}$) and Bridgman's most recent values does not seem explicable in terms of an effect on resistivity of strain, but rather must be ascribed to differences in the crystals caused by some as yet unknown conditions governing the crystal growing process.