Walter H. (Hermann) Schottky (July 23, 1886, Zürich, Switzerland - March 4, 1976, Pretzfeld, West Germany) was a German physicist who invented the screen-grid vacuum tube in 1915 and the tetrode in 1919 while working at Siemens. In 1938, Schottky formulated a theory predicting the Schottky effect, now used in Schottky diodes. July 23 is the 204th day (205th in leap years) of the year in the Gregorian Calendar, with 161 days remaining. ... 1886 (MDCCCLXXXVI) is a common year starting on Friday (click on link to calendar) // Events January 18 - Modern field hockey is born with the formation of The Hockey Association in England. ... Location within Switzerland (German pronunciation IPA: ; in English often Zurich, without the umlaut) is the largest city in Switzerland (population: 366,145 in 2004; population of urban area: 1,091,732) and capital of the canton of Zürich. ... March 4 is the 63rd day of the year in the Gregorian Calendar (64th in leap years). ... 1976 (MCMLXXVI) was a leap year starting on Thursday (the link is to a full 1976 calendar). ... 1915 (MCMXV) was a common year starting on Friday (see link for calendar). ... A tetrode is a two-grid vacuum tube. ... 1919 (MCMXIX) was a common year starting on Wednesday (see link for calendar). ... Siemens AG (FWB:SIE, NYSE: SI) is the worlds largest electronics company. ... 1938 (MCMXXXVIII) was a common year starting on Saturday (link will take you to calendar). ... The Schottky diode (named after German physicist Walter H. Schottky) is a semiconductor diode with a low forward voltage drop and a very fast switching action. ...

He was awarded the Royal Society's Hughes medal in 1936 for his discovery of the Schrot effect (spontaneous current variations in high-vacuum discharge tubes, called by him the "Schrot effect": literally, the "small shot effect") in thermionic emission and his invention of the screen-grid tetrode and a superheterodyne method of receiving wireless signals. The premises of the Royal Society in London (first four properties only). ... The Hughes Medal, named after microphone inventor David Edward Hughes, is one of several medals awarded by the Royal Society, Englands reigning academy of science. ... 1936 (MCMXXXVI) was a leap year starting on Wednesday (link will take you to calendar). ... Walter H. Schottky (July 23, 1886, Zürich, Switzerland - March 4, 1976, Pretzfeld, West Germany) was a German physicist who invented the screen-grid vacuum tube in 1915 and the tetrode in 1919 while working at Siemens. ... Thermionic emission (archaically known as the Edison effect) is the flow of electrons from a metal or metal oxide surface, caused by thermal vibrational energy overcoming the electrostatic forces holding electrons to the surface. ... The Super Heterodyne receiver (or to give it its full name, The Supersonic Heterodyne Receiver) was invented by Edwin Armstrong in 1918. ...

His father was mathematician Friedrich Hermann Schottky (1851-1935). Leonhard Euler is considered by many people to be one of the greatest mathematicians of all time A mathematician is a person whose primary area of study and research is mathematics. ...

External links

• Biography of Walter H. Schottky