gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1966.035.275.07 A Simplified Method of 2 V Determination Using 3- and 4-Axis Stages Ehlers Ernest G. Department of Mineralogy, The Ohio State University, Columbus, Ohio 9 1966 35 275 958 962 12 11 1965 Copyright © 1966, The Mineralogical Society 1966 Summary

A method is presented for use with a 3- or 4-axis stage whereby a biaxial mineral, after being oriented into the cardinal position by means of the inner vertical, NS., and EW. axes, can be placed into an orientation suitable for measurement of the 2 V as required by the Berek method. A table of the necessary manipulations is given. The stereographic projection is only used to determine rotational corrections.