. Elementary chemical microscopy. Microscopy; Microchemistry. Fig. 73. Robin Ball-and-socket Stage for Metallurgical Microscopes. Fig. 74. ten Siethoff glass Hemi- sphere. suggested fastening the specimens to a small glass hemisphere. This idea was later eleborated by E. ten Siethoff,2 who combined the hemisphere with a system of condensing lenses, thus permit- ting not only the orientation of a crystal and its study under the influence of plane polarized light sent through in the directions of the different axes of vibration, but also permitting observations with strongly converging polarized
. Elementary chemical microscopy. Microscopy; Microchemistry. Fig. 73. Robin Ball-and-socket Stage for Metallurgical Microscopes. Fig. 74. ten Siethoff glass Hemi- sphere. suggested fastening the specimens to a small glass hemisphere. This idea was later eleborated by E. ten Siethoff,2 who combined the hemisphere with a system of condensing lenses, thus permit- ting not only the orientation of a crystal and its study under the influence of plane polarized light sent through in the directions of the different axes of vibration, but also permitting observations with strongly converging polarized light in different positions. The apparatus consists of a condenser which is laid upon the stage of the microscope, the diameter of its mounting being such as to fit into the stage opening. The construction is shown in Fig. 74. The crystal fragment is laid upon the flat surface of the glass hemisphere S. 1 Robin, Traite de Metallographie, p. 50, Paris, 1912. 2 Central, f. Min., 1903, Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Chamot, Emile Monnin, 1868-1950. New York, Wiley
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