COMPUTER FUNDAMENTALS

Detailed explanation-1: -1904: British engineer John Ambrose Fleming invents and patents the thermionic valve, the first vacuum tube.

Detailed explanation-2: -John Ambrose Fleming in 1906. Image used courtesy of Wikimedia Commons. Fleming is best known for his invention of the vacuum tube and the commonly used right-hand rule in electromagnetism.

Detailed explanation-3: -Electrons could not pass in the reverse direction because the plate was not heated and not capable of thermionic emission of electrons. Fleming filed a patent for these tubes, assigned to the Marconi company, in the UK in November 1904 and this patent was issued in September 1905.

Detailed explanation-4: -The Ferranti Mark 1 (1951) is considered the first commercial vacuum tube computer. The first mass-produced computer was the IBM 650 (1953).