Harold Black (golfer)
Harold Black may refer to: * Harold Stephen Black (1898–1983), American electrical engineer * Harold Black (artist) (1913–1993), American artist * Sir Harold Black (civil servant) Sir Harold Black (9 April 1914 – 19 January 1981) was a British civil servant in Northern Ireland. He was Secretary to the Cabinet and Clerk of the Privy Council from 1965 to 1972, and Deputy Secretary, Northern Ireland Office from 1972 to 1974, ...

Harold Stephen Black
Harold Stephen Black (April 14, 1898 – December 11, 1983) was an American electrical engineer, who revolutionized the field of applied electronics by discovering the negative feedback amplifier in 1927. To some, his discovery is considered the most important breakthrough of the twentieth century in the field of electronics, since it has a wide area of application. This is because all electronic devices (vacuum tubes, bipolar transistors and MOS transistors) are inherently nonlinear, but they can be made substantially linear with the application of negative feedback. Negative feedback works by sacrificing gain for higher linearity (or in other words, smaller distortion/intermodulation). By sacrificing gain, it also has an additional effect of increasing the bandwidth of the amplifier. However, a negative feedback amplifier can be unstable such that it may oscillate. Once the stability problem is solved, the negative feedback amplifier is extremely useful in the field of electroni ...
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Harold Black (artist)
Harold Black (1913–1993) was an American artist known for his work with the Works Progress Administration (WPA). Born on December 13, 1913, in New York City he attended National Academy of Design. He was married to fellow artist Isabel Bate (1909–1995). The couple lived in New York City. They were commissioned by the WPA to complete eight murals for the U.S. Post Office in Salina, Kansas. The couple completed the murals and sent them to Salina, but they were never installed. The couple also illustrated the 1941 book '' The Kaw: The Heart of a Nation'' by Floyd Benjamin Streeter. Black's work was included in the 1940 Museum of Modern Art exhibition and competition ''The Artist as Reporter.'' Black died on January 23, 1993, in Mexico City, Mexico. His work is in the collection of the Smithsonian American Art Museum The Smithsonian American Art Museum (commonly known as SAAM, and formerly the National Museum of American Art) is a museum in Washington, D.C., part of th ...
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