Fleming valve

1904

Fleming valve

The book of science

Tom Sharp

John Ambrose Fleming electromagnetism

Fleming valve

Other names for it

Valves

Morse code signals oscillated too fast for a galvanometer to detect them, but a galvanometer was able to show tiny direct-current pulses from a Fleming value.

Fleming is the originator of the left-hand rule for electric motors, and the right-hand rule for electric generators.

See also in The book of science:

Readings on wikipedia:

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