Abstract
A method is described for the rough goniometry of small crystals using X-ray diffraction cameras. Visible light is used instead of X-rays and a photographic record of the external reflexions is obtained by either the rotating-crystal or the Weissenberg technique. Each type of photograph is discussed in detail and examples are given showing how the goniometric data for all the faces may be rapidly determined with the aid of existing charts. The method requires crystals with linear dimensions not exceeding 1 or 2 mm and will reveal faces less than 0.01 mm2. Practical details are given of the modifications of technique that are necessary and the precautions to be taken.
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