Ludwig
Boltzmann

Vienna University




Christian
Christiansen

Copenhagen University






Niels
Bohr

Copenhagen University




Jacob
Kistemaker

FOM Institute AMOLF


Gustav Robert
Kirchhoff

Universität Berlin




Johannes
Bosscha, III

Polytechnical School in Delft




Pieter
Zeeman

Amsterdam


Cornelis Jan
Bakker

University of Amsterdam, CERN

Frederik Jacques
de Heer

FOM Institute AMOLF
(Options)

Gustaaf Ronald
Möhlmann

Leiden (Chemistry Tree)

Frederik de HeerX