The microspectroscope, or spectroscopic ocular, has been known to mineralogists for many years, but because of its limited application it has never come into common use in the mineralogical laboratory. The value of the microspectroscope in mineral identification was pointed out by Wherry (1915, 1929), who described the technique employed in its use and recorded the absorption lines and bands for a large number of minerals. The type of instrument used by Wherry consisted of a small direct-vision prism spectroscope designed to replace the conventional microscope ocular. It contained a wave-length scale, and an auxiliary prism permitted the comparison of the mineral spectra with those of standard solutions. Microspectroscopeso of that type, described and illustrated by Chamot and Mason (1948), are now difficult to obtain.

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