Law for the Restoration of the Professional Civil Service
At Jena, Georg Joos was professor of theoretical physics, but in 1935, he made a compulsory transfer to head the Second Physical Institute at Göttingen to replace James Franck, who had resigned as a result of the Law for the Restoration of the Professional Civil Service in 1933. Hanle and Joos would soon be part of the impetus to initiate the German nuclear energy project, shortly after Hanle went to Göttingen. From 1937 to 1941, Hanle was again at the University of Göttingen.