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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.

review of scientific instruments

A Precision Two Crystal X-Ray Spectrometer of Wide Applicability with Worm Wheel Drive; an Improved Precise Method of Equalizing the Spacing of Worm Wheel Teeth