## A Tract on Crystallography: Designed for the Use of Students in the University |

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adjacent poles differing arc joining arc PQ arcs AP bisected circle Conic Sections containing the planes containing the poles cos ZP cot BP crystal denoted Differential Calculus e f g edges Elementary form h k form hkl form with inclined four faces Geometry hemihedral form Hence hkl hkl hkl holohedral form Hydrostatics inclined faces integers intersection joining any pole joining the poles parallel faces parameters plane HKL plane uvw pole hkl positive or negative preceding equation quadrant ratio rhombohedron sides signs sin PR situated with respect sphere of projection spherical trigonometry St John's College symmetrically situated system of planes tively Treatise triangle ABC u v w W. H. Besant Walton zero zone containing zone-axes zone-circle containing zone-circle passing