Abstract
The errors in the measurement of x-ray wave-lengths by means of gratings that are to be expected on account of the divergence of the incident beam are considered in more detail than has been done before. In particular, the displacement of the diffracted line, the displacement of the zero order, or reflected, line, the displacement of the center of the incident beam relative to the center of the grating, and the effect of the height of the slits are considered and the expressions for the errors are obtained. These are applied to one of Bearden's spectrograms, and the magnitude of the errors calculated. In this particular case, and apparently in general, the errors are less than other experimental errors.

This publication has 3 references indexed in Scilit: