On the propagation of elastic waves in aeolotropic media II. Media of hexagonal symmetry

Abstract
The general analysis presented in part I is here adapted to obtain the velocity, inverse and wave surfaces of a medium of hexagonal symmetry. Values derived from the elastic constants of (a) zinc and (b) beryl are tabulated and graphs of sections of the surfaces have been drawn. The details of the propagation of elastic plane waves in a single crystal of either substance may be obtained from the data presented.