X rays, an introduction to the study of Röntgen rays (1914)
Kaye, G. W. C. (George William Clarkson), 1880-1941 · London : Longmans, Green · leaf 204
Laue spots is a direct con-sequence of the fact that the incident pencil of X rays isnot strictly parallel but slightly conical, and so the reflectedpencil, which is obliquely received on the photographicplate, shows an elliptical section. Elliptical Loci of Laue Spots. With prolonged exposures,… … Fig. 87.—Construction demonstrating elliptical loci of Laue spots. central spot. These ellipses, which are nearly circular, aresections of circular cones having the incident beam as agenerator. The elliptical locus is a consequence of the factthat the various systems of parallel planes which can…
X-rays
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