A Tract on Crystallography: Designed for the Use of Students in the UniversityDeighton, Bell and Company, 1863 - 86 Seiten |
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adjacent poles differing arc joining arc PQ arcs AP BP sin circle containing the planes containing the poles crystal denoted e f g edges fk+gl form h kl form hk form hk l form with inclined four faces fv+gw h k l h k l h k l hemihedral form Hence inclined faces integers intersection joining any pole joining the poles meeting the plane p q r parallel faces parameters ph+qk+rl plane HKL planes h pole h kl positive or negative preceding equation pu+qv+rw qk+rl quadrant ratios rhombohedron right angles sides signs sin AP sin sin PR situated with respect sphere of projection St John's College symmetrically situated system of planes v=lp-hr zone containing zone-axes zone-circle containing zone-circle passing ગ્
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Seite 72 - ... and therefore if, from a single * "A twin-crystal is composed of two crystals joined together in such a manner " that one would come into the position of the other by revolving through two right " angles round an axis which is perpendicular to a plane which either is, or may be, " a face of either crystal. The axis will be called the twin-axis, and the plane to " which it is perpendicular the twin-plane." Miller's Treatiie on Crystallography, p. 103. In the text the word