source: H.A. Kramers archive
Source: H.A. Kramers family archive (maintained by P.N. Kuiper)  

Photograph taken in the seminar room of the institute (room number 6 in this map). The occasion of this gathering of students and friends is unknown, possibly related to the thesis defense of Uhlenbeck and Goudsmit (7 July 1927). The identity of the individual at the center (with pocket watch) is also unknown, and could help to identify the occasion.

More photographs from the same occasion:

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