Discovery of X-rays: 50th anniversary commemoration, 1945 Correspondence and papers re various events and meetings held to mark the 50th anniversary of the discovery of x-rays and the centenary of the birth of Wilhelm Conrad Roentgen, including copy of Dale's opening remarks at the Rontgen Anniversary meeting of the Royal Society on 8 November 1945. Also copy of Dale's remarks at a Roentgen Society Dinner, June 1947 1945-1947