| Citation | Distinguished for his contributions to low temperature physics. His experiments with H.E. Hall on attenuation of second sound in rotating liquid helium provided the first demonstration of the probably existence of vortex lines and later in an elegant experiment he gave the first direct proof that the circulation was quantized. His extensive studies of heat currents in liquid helium have led to a thorough understanding of mutual friction between the normal and superfluid components and of critical flow effects. At Birmingham he has continued to make important contributions not only to the liquid helium problem but also to the somewhat analogous one of flux flow and dissipation processes in type II superconductors. All his work is distinguished by an exceptionally profound analytical power in his approach both to experiment and theory. |