D O C U M E N T 5 2 F E B R U A R Y 1 9 2 2 1 3 9
in recognition of scientific achievements or contributions to the promotion of science. For details, see
Wilhelm Haensch was a partner in the firm Franz Schmidt & Haensch, which produced high-
precision instruments. Einstein read the proposal the following day during the session of the physical-
mathematical class of the Prussian Academy of Sciences (Kirsten and Treder 1979b, p. 247, No. 240).
Eugen H. Brodhun (1860–1938) was a physicist at the PTR.
The proposal for Niels Bohr’s foreign corresponding membership was submitted to the mathe-
matical-physical class the same day (see Doc. 53).
Heike Kamerlingh Onnes was officially elected foreign correspondent during the session of
16 February 1922 (GyPAW [1812–1945] II-V-135). For his paper published in French in the Commu-
nications, see Timmermans et al. 1922.
Kamerlingh Onnes 1921.
The Solvay Institute of Physics in Brussels was founded in 1912 by the Belgian industrialist
Ernest Solvay (1838–1922). Heike Kamerlingh Onnes was a member of its administrative committee.