Waves and radiations. Arnold Zommerfeld

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Laue was not the experimenter and required the help. He has addressed for council to to Arnold Zommerfeldu (1868-1951), but that has not supported it, having told that thermal movement should break correct structure of a crystal strongly. (One more example of how the great person has appeared is wrong.) Zommerfeld has refused to resolve to one of the assistants, Walter Fridrihu (1883-1968), to waste time on similar senseless experiences. Fortunately, that adhered to a different view, and by means of the friend Knippinga (1883-1935) has secretly made this experiment. They have chosen a crystal of sulphate of copper - these crystals were available in the majority of laboratories - and have collected installation.

The First exposition has not given any result; the plate settled down between a tube - a source of X-rays - and a crystal as was considered that the crystal should operate as reflective difraktsionnaja a lattice. In the second experience of Knipping has insisted on arranging photographic plates from different directions round a crystal: eventually followed consider any possibility.

On one of the plates, located behind a crystal on a way of a bunch of X-rays, the effect which they searched has been found out. So diffraction of X-rays has been opened.