1768685 William Lawrence Bragg and Harold Roper as part of a group with a motorcar on a mountain road, Vosges, 1915 (b/w photo) by English Photographer, (20th century); The Royal Institution, London, UK; (add.info.: Harold Roper Robinson (1889??955), physicist. Sir William Lawrence Bragg (31 March 1890 ??1 July 1971), Australian-born British physicist and X-ray crystallographer who, with his father, won the Nobel Prize in Physics in 1915 for his work on X-ray diffraction techniques. Bragg and Robinson were in the area learning the process of sound ranging and the others may also be part of the unit which was drawn from many different parts of the military and did not at first have a distinct uniform.); 穢 Royal Institution ; English, out of copyright.