Karl Friedrich (karl ˈfriːdrɪç). 1777–1855, German mathematician: developed the theory of numbers and applied mathematics to astronomy, electricity and magnetism, and geodesy

the cgs unit of magnetic flux density; the flux density that will induce an emf of 1 abvolt (10–8 volt) per centimetre in a wire moving across the field at a velocity of 1 centimetre per second. 1 gauss is equivalent to 10–4 tesla