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The usual film arrangements for Debye-Scherrer powder photographs are described and compared, and their adaptation to larger cameras is considered. Methods which eliminate systematic errors are given for the calculation of spacings. Particular attention is paid to cameras of 19 cm. diameter. Methods of calibration are described in detail, and an example is given of the measurement of a photograph of aluminium and the calculation of the lattice parameter from it.
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Lipson et al. (1941) studied this question.
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