Editing Philo Farnsworth (section)

===Electronic television===
Farnsworth worked out the principle of the image dissector in the summer of 1921, not long before his 15th birthday, and demonstrated the first working version on September 7, 1927, having turned 21 the previous August. A farm boy, his inspiration for scanning an image as a series of lines came from the back-and-forth motion used to plow a field.{{sfn|Schatzkin|2023}} In the course of a patent interference [[lawsuit|suit]] brought by the [[Radio Corporation of America]] in 1934 and decided in February 1935, his high school chemistry teacher, Justin Tolman, produced a sketch he had made of a blackboard drawing Farnsworth had shown him in spring 1922.  Farnsworth won the suit; RCA appealed the decision in 1936 and lost.{{sfn|Schatzkin|2023}} Farnsworth received royalties from RCA, but he never became wealthy.<ref>{{Cite book |title=Britannica Concise Encyclopedia. |publisher=Encyclopaedia Britannica, Incorporated. |year=2006 |isbn=9781593392932 |pages=658}}</ref> The [[video camera tube]] that evolved from the combined work of Farnsworth, Zworykin, and many others was used in all television cameras until the late 20th century, when alternate technologies such as [[charge-coupled device]]s began to appear.{{Citation needed|date=December 2009}}

Farnsworth also developed the "image oscillite", a cathode ray tube that displayed the images captured by the image dissector.{{sfn|Schatzkin|2023}}

Farnsworth called his device an image dissector because it converted individual elements of the image into electricity one at a time.  He replaced the spinning disks with cesium, an element that emits electrons when exposed to light.{{fact|date=July 2022}}

In 1984, Farnsworth was inducted into the [[National Inventors Hall of Fame]].{{fact|date=July 2022}}