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This article describes the design and construction of a two crystal x-ray spectrometer for the study of radiation of wave-length from (but not including) the vacuum region to about 100 X.U. Versatility coupled with precision of angular measurement is obtained by the use of worm gears, the spacing of whose teeth has been corrected by a relatively cheap but effective lapping method herein described.
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DuMond et al. (1937) studied this question.
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