Awarded the 1932 Nobel Prize in physics. TLS in German signed “W. Heisenberg,” one page, 8.25 x 11.5, Max Planck Institute for Physics letterhead, January 11, 1968. Untranslated letter to the Swiss doctor and anthroposopher, Hans Jenny, in Dornach, about his works on the subject of cymatics. Accompanied by the original mailing envelope and a secretarial letter on behalf of Heisenberg thanking Jenny for sending his work “Das Gesetz der Wiederholung.” In fine condition. RRAuction COA.