1) Electrical engineer 2) Oliver heaviside 3) Physicist 
[lunar crater] The outer wall of Heaviside has been worn and eroded by subsequent impacts, particularly to the north and south. Only the eastern rim remains relatively intact, while the western rim has been slightly distorted by the adjacent Keeler impact. The relatively flat interior floor is marked by many small craterlets and rugged terr...
[n] - English physicist and electrical engineer who helped develop telegraphic and telephonic communications