Abstract
A MEMOIR of considerable importance to all who are interested in the microscopic determination of the characters of crystals, is contributed by Prof. Klein to the Silzungsberichte of the Berlin Akademie der Wissenschaften for January 31, 1895. The two essential points of the communication are that a form of stage goniometer is described, which permits of the most complete examination of many of the principal zones of the crystal with one and the same setting of the crystal upon its holder, and that the crystal is immersed during the observations in a liquid whose refractive index is about the mean of the refractive indices of the crystal. The idea of the “Universaldrehapparat,” as the new stage goniometer is termed, appears to have suggested itself almost simultaneously to Prof. Klein and to Herr von Federow, for the former described an earlier form of it in the Sitzungsberichte of April 1891, while the latter published a description of an “Universaltischen” for the microscope in the Zeitschrift für Krystallographie of May in the same year. Herr von Federow had previously contributed to the Zeitschrift a remarkable memoir concerning a theodolitic universal goniometer, and the application of the principle of that instrument to the microscope goniometer followed naturally therefrom. The present memoir of Prof. Klein affords so admirable a description of the improved instrument, which has been constructed for him by the well-known Berlin crystallographical optician, Herr Fuess, and likewise of the mode of employing it in connection with the immersion method, that readers of NATURE may find a brief account of it not uninteresting. Unfortunately this description cannot well be illustrated, as Prof. Klein's illustrations are photographic reproductions which are unsuitable for further reproduction.
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TUTTON, A. An Improved Method for the Microscopic Investigation of Crystals. Nature 51, 608–611 (1895). https://doi.org/10.1038/051608d0
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DOI: https://doi.org/10.1038/051608d0