These documents belonged to Cornelis Dorsman (1883-1976). They were
donated to the Instituut-Lorentz by his great-grandson Jan Ritsema
van Eck, in January 2021.

Cornelis Dorsman received a Ph.D. in Amsterdam in 1908, 
with J.D. van der Waals as promotor. He then joined the
group of H. Kamerlingh Onnes in Leiden. He contributed to the discovery
of superconductivity in 1911 (he was responsible for the thermal
measurements). He left the University shortly afterwards, becoming
director of the "Levensverzekeringsmaatschappij van het Nederlands
Onderwijzers Genootschap".

Dorsman was present at the celebration of C.A. Crommelin in 1910, who
would later found the Museum Boerhaave. That document has been transferred
to the museum collection.

Carlo Beenakker