Editing Hartley oscillator (section)

== History ==

[[Image:Hartley-US-Pat 1,356,763.png|thumb|235px|Original 1915 [[patent drawing]] used a [[triode]] (#5) for amplification with three [[Electric battery|batteries]] (#9 for [[Grid bias|grid biasing]], #10 to power the triode, and #11 to [[Hot cathode|heat the cathode]]) and a [[variable capacitor]] (#2) for tuning.]]

The Hartley oscillator was invented by Hartley while he was working for the Research Laboratory of the [[Western Electric Company]]. Hartley invented and patented the design in 1915 while overseeing Bell System's transatlantic radiotelephone tests; it was awarded patent number 1,356,763 on October 26, 1920.<ref>{{cite web|title=Patent US1356763: Oscillation-generator|url=https://docs.google.com/viewer?url=patentimages.storage.googleapis.com/pdfs/US1356763.pdf|publisher=United States Office Patent|access-date=22 March 2016}}</ref> 
 
In 1946 Hartley was awarded the [[Institute of Radio Engineers]] [[IRE Medal of Honor|Medal of Honor]] "for his early work on oscillating circuits employing [[triode]] [[Vacuum tube|tubes]]" and for his work in [[information theory]] (which largely paralleled [[Harry Nyquist]]) about "the fundamental relationship between the total amount of information which may be transmitted over a transmission system of limited [[Bandwidth (signal processing)|band-width]] and the time required."<ref>{{cite web |title=Ralph Hartley |url=http://ethw.org/Ralph_Hartley|website=Engineering and Technology History Wiki |date=24 February 2016 |access-date=December 4, 2021}}</ref>