Several details are described in the preparation of capillary tubes for x-ray power specimens which greatly facilitate the synthesis of such tubes and their subsequent removal from the pilot wire. The over-all method employed is essentially that of Fricke et al. Wires of 22-gauge copper, after annealing in an atmosphere of helium, are cleaned and dipped into the cellulose acetate solution by means of a crank-driven rack. The rate of withdrawal determines the wall thickness. A method is given for centering the filled specimen tubes precisely in the powder camera by the use of a centering jig.
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Beu et al. (1948) studied this question.
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