22 × 14 cm, original printed wrappers, vi, 128 pages. Text in German. Condition: covers chipped, covers taped on spine, worn, bit browned, internally clean and good; with contemporary ownership inscription (‘Beekbergen, 12 September 1941’). See picture.
Discussion of Niels Bohr’s correspondence principle by the physicist Eberhard Buchwald (1880–1964), professor at the Technische Hochschule in Breslau. The correspondence principle, formulated by Bohr around 1913–1920, played a central role in the transition from classical to quantum theory. This booklet belongs to the popular scientific series Sammlung Vieweg. Tagesfragen aus den Gebieten der Naturwissenschaften und der Technik, Heft 67., which presented cutting-edge developments in science and technology to a broader audience. Scarce.
