The preparation of a combined gnomonic and stereographic projection of a triclinic crystal is a relatively simple procedure if carried out by the technique herein outlined. The method is suitable not only for the standard orientation, but for the first and second permutations; these latter are likely to be met when using the Buerger x-ray precession camera. Such a projection is useful because: (1) it enables one to make graphical calculations of crystal constants avoiding any gross errors; (2) it clearly shows which angles are obtuse, which acute; (3) it serves as a base from which to derive useful formulae. The principles herein elucidated may be applied readily to non-triclinic crystals, which are always simpler to handle.

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