Radar Defense System Physicist, Sir Robert Watson-Watt, (Scotland) was the mind behind the radar network on the coast of England that detected incoming German aircraft in World War II. He had worked on the radio detection of thunderstorms (hazardous to aviators) during World War I. In 1935 he proposed a method for locating aircraft by a radio-pulse technique. The radar system was invaluable to the defense of Britain during the Battle of Britain in 1940. It operated day and night over a range of 40 miles, giving the Royal Air Force information about the height and bearing of German planes. Kerr. visit my website for some great bargains www.sonorared.com