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File:Niels Bohr Albert Einstein by Ehrenfest.jpg

Description Niels Bohr and Albert Einstein.
The picture was taken at Ehrenfest's home in Leiden, the occasion was most likely the 50th anniversary of Hendrik Lorentz' doctorate (December 11, 1925).
Date 1925-12-
Source http://www.dfi.dk/dfi/pressroom/kbhfortolkningen/
Author Paul Ehrenfest
Original uploader was Graf at de.wikipedia
Permission
( Reusing this file)

PD-OLD.
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