![]() As a result he was appointed head of the Bawdsey Research Station in Felixstowe.īy the outbreak of the Second World War in September 1939, Watson-Watt had designed and installed a chain of radar stations along the East and South coast of England. It was called radar (radio detection and ranging). His idea was based on the bouncing of a radio wave against an object and measuring its travel to provide targeting information. Tizard was impressed with the idea and on 26th February 1935, Watson-Watt demonstrated his ideas at Daventry. ![]() This was presented to Henry Tizard, the chairman of the Committee for the Scientific Survey of Air Defence. ![]() In 1935 Watson-Watt wrote a paper entitled "The Detection of Aircraft by Radio Methods". The first practical radar system was produced in 1935 by the British physicist Sir Robert Watson-Watt, and by 1939 England had established a chain of radar stations along its south and east coasts to detect aggressors in the air or on the sea. The first successful radio range-finding experiment occurred in 1924, when the British physicist Sir Edward Victor Appleton used radio echoes to determine the height of the ionosphere, an ionized layer of the upper atmosphere that reflects longer radio waves. Some years later a German engineer Chistian Huelsmeyer proposed the use of radio echoes in a detecting device designed to avoid collisions in marine navigation. Inherent in Maxwell’s equations are the laws of radio-wave reflection, and these principles were first demonstrated in 1886 in experiments by the German physicist Heinrich Hertz. British physicist James Clerk Maxwell developed equations governing the behaviour of electromagnetic waves in 1864.
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