The atomic theory of the quantum at the origin of the atomic spectra

Two German physicists, James Franck and Gustav Hertz, receive a subsidy worth 2,000 Belgian francs (i.e. about 528,730 Belgian francs or 13,120 euros in 2017) for research on the ionization work and the free path of electrons in gazes.

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James Frank (1882-1964)

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Lettre d'Émile Tassel à Ernest Solvay, 19 juillet 1913

Summary of the CSI’s expenditures on subsidies and request by the Administrative Committee for an exceptional additional sum.

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Lettre d'Ernest Solvay à Émile Tassel, 21 juillet 1913

Ernest Solvay agrees to increase the ‘subsidies’ budget for the first year: the additional sum of 7,800 Belgian francs (i.e. about 2,066,750 Belgian francs or 51,240 euros in 2017) enables the IIPS to honour the request made by James Franck and Gustav Hertz.

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Gustav Hertz (1887-1975)