A rapid, routine method is described for determining lattice constants of medium precision from single crystals with the conventional Weissenberg camera. The method involves the determination of a film correction factor, as a function of the reflection angle θ, from the powder pattern of a standard calibration substance exposed on the zero-level Weissenberg film of the single crystal. Lattice constants are obtained by the Bradley and Jay graphical extrapolation method. The experimental results on quartz and colemanite indicate that a precision of about 2 to 4 parts in 10,000 may be easily attained, and that the method is probably inherently capable of giving more precise results.

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