28 July 2015

Vacuum tube

The invention:

 A sealed glass tube from which air and gas have
been removed to permit electrons to move more freely, the vacuum
tube was the heart of electronic systems until it was displaced
by transistors.

The people behind the invention:

Sir John Ambrose Fleming (1849-1945), an English physicist
and professor of electrical engineering
Thomas Alva Edison (1847-1931), an American inventor
Lee de Forest (1873-1961), an American scientist and inventor
Arthur Wehnelt (1871-1944), a German inventor