AN EINSTEIN CHRONOLOGY 529
April 21. E. resigns from the Bavarian Academy of Sciences.
An exchange of letters between E. and Freud is published as a slim vol-
ume entitled Why War?
June 10. E. gives the Herbert Spencer lecture in Oxford.
September 9. E. leaves the European continent for good and goes to
England.
October 17. Carrying visitors visas, E., his wife, Helen Dukas, and
Mayer arrive in the United States and proceed to Princeton that same day.
A few days later the first three move to 2 Library Place.
Use and Margot stay in Europe.
1934 Death of Use Kayser-Einstein in Paris. Soon thereafter, Margot and her
husband join the family in Princeton.
1935 May. E. makes a brief trip to Bermuda. From there he makes formal appli-
cation for permanent residency in the United States. It is the last time that
he leaves the United States.
Autumn. The family and Helen Dukas move to 112 Mercer Street in
Princeton.
E. receives the Franklin medal.
1936 September 7. Death of Marcel Grossmann.
December 20. Death of Elsa E.
Hans Albert E. receives a Ph.D in Technical Sciences from the ETH.
1939 Maja joins her brother at Mercer Street, which remains her home for the
rest of her life.
August 2. E. sends a letter to F. D. Roosevelt in which he draws the lat-
ter's attention to the military implications of atomic energy.
1940 October 1. In Trenton, Judge Phillip Forman inducts Margot, Helen
Dukas, and E. as citizens of the United States. E. also retains his Swiss
citizenship.
1943 May 31. E. signs a consultant's contract (eventually extended until June 30,
1946) with the Research and Development Division of the U.S. Navy
Bureau of Ordnance, section Ammunition and Explosives, subsection 'High
Explosives and Propellants.' His consultant's fee is $25 per day.
1944 A copy of E.'s 1905 paper on special relativity, handwritten by him for this
purpose, is auctioned for six million dollars in Kansas City, as a contribution
to the war effort (manuscript now in Library of Congress).
1945 December 10. E. delivers an address in New York, 'The War is Won but
Peace is Not.'
1946 Maja has a stroke and remains bedridden.
E. agrees to serve as chairman of the Emergency Committee for Atomic
Scientists.
October. E. writes an open letter to the general assembly of the United
Nations, urging the formation of a world government.
1947 Hans Albert E. is appointed professor of engineering at the University of
California, Berkeley.
1948 August 4. Death of Mileva in Zurich.
December. An exploratory laparotomy on E. discloses a large intact aneu-
rysm of the abdominal aorta.