Herewith is described a modified technique for taking orientation photos and evaluating them with some precision. Also are discussed for the triclinic case: (1) the identification of non-axial precessing directions; (2) the indexing of non-axial precession photos; and (3) the computation of reciprocal lattice spacings in non-axial directions. The paper concludes with simplified charts for determining the setting of the various layer-line screens.

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