X-rays and Crystals


MESSRS. FRIEDRICH, KNIPPING AND LAUE have recently published (K. Bayer. Akad. der Wiss., 1912, p. 303) some remarkable effects obtained by passing a fine stream of X-rays through a crystal before incidence upon a photographic plate. A curious arrangement of spots is found upon the plate, some of them so far removed from the central spot that they must be ascribed to rays which make large angles with the original pencil.

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