John Ambrose Fleming

John Ambrose Fleming, delivering lecture from within a commercial Fleming tube.

John Ambrose Fleming is a crime-fighting secret hero.

He uses the secret identity of Sir John Ambrose Fleming FRS, a British electrical engineer and physicist known for inventing the Fleming tube (the first thermionic valve or vacuum tube).

In the News

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  Electrical engineer and physicist John Ambrose Fleming assures the public that he is "an engineer and a scientist, but hardly a hero."

Nonfiction cross-reference

• John Ambrose Fleming (nonfiction)