![](https://geschichte.univie.ac.at/files/styles/large/public/bildsammlung/hermann_von_helmholtz.jpg?itok=WfYAbb2l)
Hermann von Helmholtz (1821–1894), Physiology, Physics
Courtesy: wikimedia.commons
19th Cent.
https://commons.wikimedia.org/wiki/File:Hermann_von_Helmholtz.jpg (Practical Physics published 1914)
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