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German inventor Karl Ferdinand Braun invented cathode ray oscilloscope (CRO). 1901: First transatlantic radio transmission by Guglielmo Marconi 1901: American engineer Peter Cooper Hewitt invented the Fluorescent lamp. 1904: English engineer John Ambrose Fleming invented the diode. 1906: American inventor Lee de Forest invented the triode. 1908
Thermionic (vacuum-tube) diodes and solid-state (semiconductor) diodes were developed separately, at approximately the same time, in the early 1900s, as radio receiver detectors. [9] Until the 1950s, vacuum diodes were used more frequently in radios because the early point-contact semiconductor diodes were less stable.
M. George Craford (born December 29, 1938) is an American electrical engineer known for his work in Light Emitting Diodes (LEDs).. Raised in an Iowa farming community, he studied physics at the University of Iowa, where he earned his BA in 1961.
1962 Nick Holonyak Jr. develops the first practical visible-spectrum (red) light-emitting diode. 1963 Kurt Schmidt invents the first high pressure sodium-vapor lamp. [18] 1972 M. George Craford invents the first yellow light-emitting diode. 1972 Herbert Paul Maruska and Jacques Pankove create the first violet light-emitting diode.
Nick Holonyak Jr. (/ h ʌ l ɒ n j æ k / huh-LON-yak; November 3, 1928 – September 18, 2022) was an American engineer and educator.He is noted particularly for his 1962 invention and first demonstration of a semiconductor laser diode that emitted visible light.
The earliest pipes were made of clay, and are found at the Temple of Bel at Nippur in Babylonia. [127] [b] 4000 BC: Oldest evidence of locks, the earliest example discovered in the ruins of Nineveh, the capital of ancient Assyria. [130] 4000 BC – 3400 BC: Oldest evidence of wheels, found in the countries of Ukraine, Poland, and Germany. [131 ...
Plenty know J. Robert Oppenheimer's name, but do you know the Ames scientists who contributed to the atomic bomb?
Millions of these diodes were manufactured at the Slatersville plant every year. With the advent of silicon diodes in 1962 there was a decreasing demand for these germanium diodes, so Philips transferred their germanium Post Alloy Diffused Transistor (PADT) manufacturing to Slatersville to take advantage of the site's capacity.