Hermann von Helmholtz

German physicist and physiologist (1821-1894)

thermodynamic potential

elliptic partial differential equation (∇²+𝑘²)𝑓=0

process of energy release of a contracting star or planet

phenomenon of air resonance in a cavity

arrangement of two circular coils with distance equal to radius for a homogeneous magnetic field in the center

fluid instability that occurs when there is velocity shear in a single continuous fluid or a velocity difference across the interface between two fluids

theorem

thermodynamic equation

postulated existence of three photoreceptor types in the eye

thumb|An eye doctor examining a patient with a keratometer thumb|Typical presentations of keratoconus as detected through a keratometer thumb|Shin Nippon Nvision K-5001 Refkeratometer A keratometer, also known as an ophthalmometer, is a diagnostic instrument for measuring the curvature of the anterior surface of the cornea, particularly for assessing the extent and axis of astigmatism. It was invented by the German physiologist Hermann von Helmholtz in 1851, although an earlier model was developed in 1796 by Jesse Ramsden and Everard Home.

lunar impact crater

system for naming musical notes

theorem