A Tract on Crystallography: Designed for the Use of Students in the University |
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according alternate appears arc joining arrangements axes axis called CHAPTER circle combination consists corresponding crystal denoted edges Edition equal equation expressions form h kl given greater h k l hemihedral form Hence inclined faces indices integers intersection joining any pole joining the poles knowing known less measured meet observing obtain opposite p q r parallel faces parameters places planes h kl points pole h kl positive or negative preceding equation quadrant ratio respectively right angles sides signs sin BP situated with respect straight lines suppose surface symbol system of planes third tively triangles u v w zero zone zone-axes zone-circle containing zone-circle passing
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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