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Sonar (sound navigation and ranging or sonic navigation and ranging) [2] is a technique that uses sound propagation (usually underwater, as in submarine navigation ...
Reginald Aubrey Fessenden (October 6, 1866 – July 22, 1932) was a Canadian electrical engineer and inventor who received hundreds of patents in fields related to radio and sonar between 1891 and 1936 (seven of them after his death).
Passive sonar was introduced in submarines during the First World War, but active sonar ASDIC did not come into service until the inter-war period. Today, the submarine may have a wide variety of sonar arrays, from bow-mounted to trailing ones. There are often upward-looking under-ice sonars as well as depth sounders.
Asdic was the British version of sonar developed at the end of World War I based on the work of French physicist Paul Langevin and Russian engineer M. Constantin Chilowsky. . The system was developed as a means to detect and locate submarines by their reflection of sound wa
Hedy Lamarr (/ ˈ h ɛ d i /; born Hedwig Eva Maria Kiesler; November 9, 1914 [a] – January 19, 2000) was an Austrian-born American actress and inventor. After a brief early film career in Czechoslovakia, including the controversial erotic romantic drama Ecstasy (1933), she fled from her first husband, Friedrich Mandl, and secretly moved to Paris.
Most people know dolphins have incredible sonar abilities. ... Volleyball and basketball were both invented in Massachusetts, each by a Springfield College grad in the late 19th century.
The first fishfinder, i.e. sonar device meant to find underwater fish or schools of fish, was invented in Japan in the 1940s by the Furuno brothers, who were radio repairmen. Building from the knowledge of fishermen who were able to determine the presence of fish, and their number, from bubbles, the Furuno brothers first planned to detect these ...
French physicist Paul Langevin and Russian engineer Constantin Chilowsky invented sonar: 1917: American engineer Alexander M. Nicholson invented the crystal oscillator: 1918: French physicist Henri Abraham and Eugene Bloch invented the multivibrator: 1919: Edwin Howard Armstrong developed the standard AM radio receiver 1921