Letter from Harold C. Urey to Kasimir Fajans, January 28, 1947
Harold C. Urey (1893-1981) asks Kasimir Fajans (1887-1975) to contribute money to help Karl Friedrich Bonhoeffer (1899-1957) recover from angina pectoris (chest pain). Urey thinks that Bonhoeffer is suffering from this medical condition due to the violence he endured by the Nazis.
Bonhoeffer, along with fellow chemist Paul Harteck (1902 – 1985), discovered the spin isomers of hydrogen, orthohydrogen, and parahydrogen. The two were the first to synthesize pure parahydrogen in 1929.
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Urey, Harold Clayton. “Letter from Harold C. Urey to Kasimir Fajans, January 28, 1947,” January 28, 1947. Papers of Georg and Max Bredig, Box 9, Folder 17. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/hb54lue.
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