Hermann Ludwig Ferdinand von Helmholtz

(1821—1894) German physiologist and physicist

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German physiologist and physicist. In 1850 he measured the speed of a nerve impulse and in 1851 invented the ophthalmoscope. Helmholtz discovered the conservation of energy (1847), giving many examples of its application, and also introduced the concept of free energy.

Subjects: Science and Mathematics — Arts and Humanities.

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