Abstract
TWO pictures of the actual apparatus employed (one of which is produced in Fig. 7), and an explanatory diagram of it (Fig. 8), will enable the precise nature of the experiment to be grasped. A plate, 1 cm. square and 0.5 mm. thick, was cut from a good crystal of zinc blende parallel to a cube face, and adjusted on the crystal holder of a goniometer in the path of a very narrow pencil of X-rays from the bulb, isolated by their passage through a succession of lead screens (lead being impervious to X-rays) pierced by small holes. The last screen, which gave the final form to the pencil of rays, was a plate of lead 1 cm. thick, pierced by a cylindrical hole 0.75 mm. in diameter, and fitted with a delicate means of adjustment so that the axis of the boring could be brought exactly perpendicular to the crystal plate. The beam of pure X-rays of circular section, after passing normally through the crystal plate, was received on a Schleussner-Rontgen photographic plate, which was afterwards developed with rodinal.
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