The paper discusses the measurement of rotation properties of anisotropic ore minerals in reflected light. The theory of measurement is first examined, and measurements according to the Berek and Hallimond methods are appraised. Three types of microscope equipment now available for quantitative work, including a new type of microscope produced by Bausch and Lomb Optical Company, are described, and procedures of measurement with each are given in detail.

First Page Preview

First page PDF preview
You do not currently have access to this article.