Abstract
THIS very useful volume forms an introduction to the author's crystallographic investigations which earned the prize, of the Vienna Academy. It deals exclusively with the principles and the methods employed in those investigations, and constitutes a complete storehouse of the formulas required in the study of crystals, and of the best means of applying those formulæ. The following subjects are successively treated: the optical principles involved in the goniometer; the practical use of the instrument, and the errors to which it is liable; the criticism of probable errors of observation; stereographic projection; all possible cases of trigonometrical calculation, including the method of least squares; and a slight sketch of the use of the polarising apparatus. Krystallographische Untersuchungen an homologen und isomeren Reihen. Von Dr. A. Brezina. I. Theil. Methoden. (Wien, 1884.)
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