KINGDOM OF SERBIA - GERMAN OCCUPATION WW2. BILLET : 500 DINARS, BON D' ETAT with monetary exchange value, blue with the arms of Serbia, issued January 1, 1943 - TTB

SCIENCE - PUPIN Michael (1858 - 1935) - Typed letter signed Typed letter signed, dated “November 16, 1928” by the Serbian physicist, physical chemist and philanthropist. Pupin is best known for his numerous patents, including a means of greatly extending the range of long-distance telephone communication. He was a founding member of National Advisory Committee for Aeronautics (NACA) on 3 March 1915, which later became NASA, and he participated in the founding of American Mathematical Society and American Physical Society. Addressed to the American impressionist painter and President of the Society of Arts and Sciences Walter Russell (1871-1963), recommending a gentleman: “…Robert Andrews Millikan is a very good candidate for the Science Medal for 1929. I certainly approve of Dr. Slosson’s suggestion. May I add that Mr. Davisson of the Wester Electric Co. has made a very important discovery lately; the discovery, namely, that moving electrons when reflected by metalic surfaces, behave like sources of radiatons…”. 1 p. In-8. With letterhead. - This item is under temporary import. If the item is delivered within the United Kingdom, it will be subject to a 5% Value Added Tax (VAT) on the hammer price.