Herman Von Helmholtz.
D000162:Acoustics / Q000266:history; D005858:Germany; D049672:History, 19th Century; D008887:Military Medicine / Q000266:history; D009482:Neurophysiology / Q000266:history*; D009887:Ophthalmoscopy / Q000266:history*; D055095:Optics and Photonics / Q000266:history; D010827:Physiology / Q000266:history