. Biographies of distinguished scientific men. Scientists; genealogy. REPEATING GONIOMETER. 161 brought to perfection without at the same time inducing a corresponding amelioration in the latter. In propor- tion as the crystallographic ideas of Haiiy acquired more exactness, it was found necessary to employ, for the meas- urement of the angles of the crystals, methods of increas- ing precision. Wollaston supphed this want by the invention of the reflective goniometer which bears his name.* Mains hesitated fully to adopt the idea, after it had occurred to him as the only mode of representing po
. Biographies of distinguished scientific men. Scientists; genealogy. REPEATING GONIOMETER. 161 brought to perfection without at the same time inducing a corresponding amelioration in the latter. In propor- tion as the crystallographic ideas of Haiiy acquired more exactness, it was found necessary to employ, for the meas- urement of the angles of the crystals, methods of increas- ing precision. Wollaston supphed this want by the invention of the reflective goniometer which bears his name.* Mains hesitated fully to adopt the idea, after it had occurred to him as the only mode of representing polarization, on the ground of being unable to reconcile it with mechanical notions; and this more precisely as to the notion of ii'ansverse vibrations alone being produced, -which constituted this theory in all its simphcity; whereas Young had (as we have just seen) believed both these and longitudinal xibrsLtions to coexist. To establish this point, he expressly says, was the main dif- ficulty which embarrassed him.^i—Translator. * The essential principle of the reflective goniometer of Wollaston is extremely simple, and consists in this: a piece of crystal or any. 1 Ann. de Chimie, 1831, tom. xvii, p. 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 Arago, F. (François), 1786-1853; Smyth, W. H. (William Henry), 1788-1865; Powell, Baden, 1796-1860; Grant, Robert, 1814-1892; Fairbairn, William, Sir, 1789-1874. Boston, Ticknor and Fields
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