James Tuck was a British physicist who, among other things, helping to develop the notion of explosive lensing for the implosion mechanism for the first atomic bomb at Los Alamos during World War II as the Director of the British delegation to the Manhattan Project, and later did research on nuclear fusion as part of Project Sherwood . In 1937 he helped design the betatron with Leo Szilard. Tuck was later knighted for his contributions to nuclear physics.