Sir William Henry Bragg was a British X-ray crystallographer who uniquely shared a Nobel Prize with his son Lawrence Bragg – the 1915 Nobel Prize in Physics "for their services in the analysis of crystal structure by means of X-rays," an important step in the development of X-ray crystallography. The Nobel Prize in Physics 1915, announced November 12, 1915. William Bragg and Lawrence Bragg, “for their services in the analysis of crystal structure by means of X-rays”. William Bragg: born 1862, Wigton, United Kingdom. Lawrence Bragg: born 1890, Adelaide, Australia. Wiki link Wiki link Data: the Nobel Foundation (CC0).