2 résultats
184045035Paris Fortin Masson et Cie 1840. 8vo. Without wrappers. Disbound. In: 'Annales de Chimie et de Physique' 2e Series tome 73 Cahier 4. Pp. 337-446 a. 1 plate. entire issue offered. Senarmont's paper: pp. 337-362. Some scattered brownspots. <br/><br/><em>First appearance of Senarmont's first paper in crystallography an importent paper in the history of the subject."Sénarmont’s enthusiasm for crystallography was first awakened by Fresnel. His importance is based on his demonstration of the directional dependency of the physical properties of crystals and on his experiments on the synthesis of minerals under conditions corresponding to those in nature. In his first paper "Memoire sur les modifications que la reflexion spécularire á la surface des corps metalliques imprime á un rayon de lumiere polarisee" 1840 Sénarmont introduced for the purpose of measuring phase differences a thin layer of mica known as the 1/4 yps. plate."DSB. </em> unknown
182546098London G. and W. Nicol 1825. 4to. No wrappers as extracted from "Philosophical Transactions" 1825 - Part I. Pp. 87-130 and 2 engraved plates with many figs. Upper right corner dampstained mostly on the first page and here only slightly touching a few letters. <br/><br/><em>First appearance of this importent paper in which Whewell gave crystallography a mathematical foundation."In a paper read before the Royal Society in 1824 Whewell according to Herbert Deas "laid the foundations of mathematical crystallography." His system for calculating the angles of planes of crystals assumed that crystals are aggregates of small rhomboids that can be thought to shrink below the level of possible measurement thus suggesting that crystals are latticelike. In 1825 Whewell visited Mohs in Germany. In 1828 the year in which Whewell became professor of mineralogy he published a revision of Mohs’s system of mineralogical classification."DSB. </em> unknown