A Treatise on Crystallography #265257

Arts. 172. Axes. 173. Holohedral forms. 174, 175. Hemihedral forms. 176. To determine the position of any pole. 177 — 179. Arrangement of the poles of holohedral and hemihedral forms. 180 — 183. To find the distance between two poles of the same form. 184, 185. To find the distance between any two poles. 186, 187. To find the indices. 188, 189. To find the para meters. 190 — 198. To determine the figures and angles of different forms.