Adriaan Fokker
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Adriaan Daniël Fokker was a Dutch physicist and musicologist who worked in the fields of special relativity and statistical mechanics. He is the inventor of the Fokker organ, a 31-tone equal-tempered
Fokker in 1926
A.D. Fokker in his organ in 1950
Paul Ehrenfest
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Paul Ehrenfest was an Austrian theoretical physicist who made major contributions to statistical mechanics and its relation to quantum mechanics, including the theory of phase transition and the Ehren
Adriaan Fokker
…H. Bragg at Leeds. In 1917, after his military service during World War I, Fokker returned to Leiden University as an assistant to Hendrik Lorentz and Paul Ehrenfest. In 1921, he became a physics teacher at the Gymnasium of Delft, and in 1923 was appointed Professor of Applied Physics at Technische Hoogeschool Delft…
Ehrenfest, c. 1910s
Ehrenfest's students, Leiden 1924. Left to right: Gerhard Heinrich Dieke, Samuel Abraham Goudsmit, Jan Tinbergen, Paul Ehrenfest, Ralph Kronig, and Enrico Fermi
Niels Bohr and Albert Einstein debating quantum theory at Ehrenfest's home in Leiden (December 1925).