British Dictionary definitions for h. ludwig ferdinand von helmholtz
Baron Hermann Ludwig Ferdinand von (ˈhɛrman ˈluːtvɪç ˈfɛrdinant fɔn). 1821–94, German physiologist, physicist, and mathematician: helped to found the theory of the conservation of energy; invented the ophthalmoscope (1850); and investigated the mechanics of sight and sound
(hělm'hōlts') German physicist and physiologist who was a founder of the law of conservation of energy. Helmholtz did pioneering research on vision and invented an instrument for examining the interior of the eye in 1851.