The Fleming valve, also called the Fleming oscillation valve, was a thermionic valve or vacuum tube invented in 1904 by English physicist John Ambrose Fleming as a detector for early radio receivers used in electromagnetic wireless telegraphy. It was the first practical vacuum tube and the first thermionic diode, a vacuum tube whose purpose is to conduct current in one direction and block current flowing in the opposite direction.
invented by Robert H. Goddard
A liquid-propellant rocket or liquid rocket utilizes a rocket engine that uses…
invented by Franz Fischer Hans Tropsch
The Fischer–Tropsch process is a collection of chemical reactions that…
invented by J.W. Horton Warren Marrison
Quartz clocks and quartz watches are timepieces that use an electronic…
invented by Xerox PARC
Produced at Xerox PARC by Butler Lampson, Charles Simonyi and colleagues.
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