Robert G. Aitken: the Twenty-First Bruce Medalist

After awarding two successive Bruce Medals to theoretical astrophysicists in their forties, the A.S.P. returned to a more familiar type of medalist, a senior astronomer who still looked through telescopes. Although most observers had turned to photography and spectroscopy, Robert G. Aitken was still observing visually, and he was so good at it that he was the world's leader in the discovery of measurement of double stars.