5 6 8 CALENDAR 1920
1920 May 1 Announcement of his election as corresponding member of
the Danish Royal Academy of Sciences and Letters. Physi-
kalische Zeitschrift 21 (1920): 248.
2-page TLC to Vieweg publishing house. In response to
their letter (see 28 April 1920 in Vol. 9, Calendar), asks to
inform Methuen that he is demanding 4 cents per copy for
the addenda to the English edition of Einstein 1917a to be
published in the United States, rather than only 1.5 cents for
the American publication, because this amounts to the two
pence agreed upon for the English publication. If Methuen
does not accept this condition, he will withdraw his consent,
since it will be easy to find an American publisher. He
agrees to include these addenda in the next German edi-
tions, as well as a new supplement on the cosmological
problem, provided that he will receive 20% as remunera-
tion, because of the devaluation of the mark since the publi-
cation of the first edition. [42 038].
before May 2 Is invited by the Royal Danish Astronomical Society. Ger-
man Embassy in Oslo to Foreign Office, 26 June 1920.
GyBSA, I. HA, Rep. 76 Vc, Sekt. 1, Tit. 11, Teil 5, Nr. 55,
Bl. 51. [82 260].
May 2 2-page ALS from Rudolf Seeliger. In answer to the letter of
KWIP board of directors (see 30 April 1920 in Vol. 9, Cal-
endar), he restates the purpose of his research (middle of
December 1919 in Vol. 9, Calendar), and adds that since his
first application he has managed to acquire the necessary
instruments. Now he requests the 1,500–2,000 M for a bat-
tery and for discharge tubes of molten quartz. GyBP, I. Abt.,
Rep. 34, Nr. 10, Mappe Seeliger. [77 617].
May 3 1-page TLS to KWIP board of trustees. The board of direc-
tors granted 2,000 M in additional support for Rudolf
Seeliger. GyBP, I. Abt., Rep. 1A, Nr. 1657. [77 315].
1-page ALS from Friedrich Czapek. Solicits short paper for
Prague scientific journal Lotos as a remembrance of Ein-
stein’s Prague times.
[43 499].
2-page ALS from Gösta Mittag-Leffler. Einstein’s letter of
12 April 1920 (see Vol. 9, Calendar) reached him in Rome.
His secretary had already informed Einstein that it is not too
late to prepare a contribution to the volume of Acta Mathe-
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