C A L E N D A R 1 9 2 0 5 9 5
after January 5 1-page Dft to Joseph Lipka, in Ilse Einstein’s hand, on the
verso of Lipka’s letter (see entry of 5 January). Lectures
only six weeks in Leyden, and not at all in Berlin for the
time being. On topics close to Einstein’s interest, Lipka may
contact him in person. There are classical calculations on
angular momentum and torque at the bottom half of the
page. Provenance: IsJHU. [44 349].
January 9 1-page TDftS from Max Planck. With the copy of his letter
to Mendelssohn & Co. appended, allows them to remit
2,000 M to Erwin Freundlich. Provenance: GyBP, I. Abt.,
Rep. 1A, Nr. 1657. [77 306].
The Council of the Royal Astronomical Society does not
confirm its earlier decision (see entry of 12 December) to
award Einstein its Gold Medal.
January 10 Treaty of Versailles comes into effect.
before January 14 Dedication of Gerdt von Bassewitz’s children’s classic
Peterchens Mondfahrt to Felix Oppenheim-Errera: “Felix
Oppenheim dem Kleinen/ Von den saemtlichen Einsteinen/
Dass er ja sie nicht vergisst/ Jeder hier verewigt ist. A. E.
pinxit.” Silhouettes made by Einstein of Elsa, Ilse, Margot,
and of himself pasted on the first page of the book. Prove-
nance: Felix Oppenheim-Errera. IsJHU. [31 011.1]. See
also Hoffmann 1972, p. 250. For Einstein’s spending two
hours at midnight on making the silhouettes and for his sat-
isfaction comparable with what he had felt when completing
the theory of general relativity, see Elsa Einstein to the
Oppenheim family, around 14 January 1920. Provenance:
Felix Oppenheim-Errera. IsJHU. [31 012].
January 14 1-page TLS from Adolf von Harnack. Invites Einstein to a
lecture by the director of KWI for Brain Research on “The
Study of Spiritual and Mental Life [Seelen- und Hirnleben]
of the Dog and Carrier Pigeon as Central Problem of the
Investigation of These Animals.” Provenance: GyBP,
I. Abt., Rep. 34, Nr. 6, Mappe KWG. [78 106].
2-page TLS from Konrad Sannig & Co. Thanks for the five
copies of Einstein’s expert opinion on German patent
269498 (Vol. 7, Doc. 30). Asks appointment for further dis-
cussion of the matter. Provenance: IsJHU. [35 370].