A Direct-Reading, Two-Crystal X-Ray Spectrometer

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Abstract
A two‐crystal x‐ray spectrometer is described in which wave‐lengths are read directly to 0.01 X.U. from the drum of a precision micrometer screw. Methods of initial adjustment are given in brief outline and as sample results there are shown the close lines Lγ2 and Lγ6 of Au(79); and the ``foot'' of Lα1 of the same element, with the accompanying satellites, the intensity of which is found to be 0.060 of that of Lα1.