Arnold Sommerfeld, German physicist, c 1930.
© Science Museum / Science & Society Picture Library
Etching of Arnold Sommerfield (1868-1951), the German physicist who modified Niel Bohr's model of the atom in 1916. He lectured for many years at the University of Munich in Germany. Printed by the International Telecommunication Union (1955-1964). Dimensions: 230mm x 190mm.