Ralph Hartley

Ralph Hartley
Born	(1888-11-30)November 30, 1888 Sprucemont, Nevada, U.S.
Died	May 1, 1970(1970-05-01) (aged 81) Summit, New Jersey, U.S.
Nationality	American
Alma mater	University of Utah Oxford University
Known for	Hartley function Hartley modulator Hartley oscillator Hartley transform Shannon–Hartley theorem
Awards	IEEE Medal of Honor (1946)
Scientific career
Fields	Electrical engineering

Ralph Vinton Lyon Hartley (November 30, 1888 – May 1, 1970) was an American electronics researcher. He invented the Hartley oscillator and the Hartley transform, and contributed to the foundations of information theory.

His legacy includes the naming of the hartley, a unit of information equal to one decimal digit, after him.