Hermann Ludwig Ferdinand von Helmholtz, 1907. Helmholtz (1821-1894), German physicist and physiologist, inventor of the ophthalmascope (1850), was distinguished in a number of fields including mathematics and mathematical and experimental physics. Obverse of a commemorative medal struck to mark the International Physiological Congress in 1907.

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Photo credit: © World History Archive / Alamy / Afripics
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