<p style='text-align: justify;'>Sir Charles Drummond Ellis joined the Laboratory soon after the First World War and became a leading figure in β-ray radioactivity. In 1927 he confirmed the continuous nature of the spectrum of β-ray particles in nuclear interactions. He was appointed to the Wheatstone chair of physics at King's College London in 1937 and was a member of the MAUD committee during the war.</p>