On the optical study of minerals in convergent polarized light

Abstract

This article proposes an attempt to deduce the main principles underlying the use of converging light, based on the basics of the theodolite method. This particular path is the most appropriate if you follow the requirement to go from simpler to more complex. As will be seen from what follows, the logical development in this the direction of the main provisions of the theodolite method leads to almost the same ideas from which Becke proceeded when explaining the phenomena detected by a crystal in converging light. In addition to some theoretical interest that the presentation of these techniques may have, based on the ideas underlying the theodolite method, it seemed to me useful for the purpose of comparatively assessing the limits of application of each of these two different methods of research (see article).