Sir William Henry Bragg OM KBE PRS ( 2 July 1862 â `` 10 March 1942 ) was a British physicist , chemist , mathematician and active sportsman . Sir William Henry Bragg OM , KBE , PRS ( 2 July 1862 â `` 10 March 1942 ) was a British physicist , chemist , mathematician and active sportsman who uniquely shared a Nobel Prize with his son William Lawrence Bragg - the 1915 Nobel Prize in Physics .