Abstract

<h2>Acta Crystallographica Section A</h2><h3>Crystal Physics, Diffraction, Theoretical and General Crystallography</h3><h3>0567-7394</h3> <h2>research papers</h2> Volume 24 Part 1 Page 4 January 1968 <h2>Professor P. P. Ewald</h2> W. L. Bragg Professor P. P. Ewald BY SIR LAWRENCE BRAGG I first got to know Ewald personally at the famous meeting at his mother's house on the Ammersee in Bavaria. It was not long after the end of World War I. Ewald had been developing the dynamic theory of X-ray diffraction, and he arranged a conference to discuss this and other X-ray analysis problems. We stayed in the inn at Holzhausen and our meetings were held in Mrs Ewald's studio. The English contingent consisted of Darwin, James and myself. Before the war Darwin had worked out the theoretical treatment of diffraction by perfect and imperfect crystals and James and I felt we were bringing along the British seeded player to represent our country at the meeting. To our consternation we found that Darwin had typically omit- ted to refresh his memory of his own theories and was unable to explain them when he got up to make his contribution! Most of the pioneers of X-ray analysis were there, it was a wonderful reunion.