The John Fleming invented the first radio tube, the diode, in this year 1904. Two years later, Robert von Lieben or Lee De Forest independently developed the amplifier tube, called the triode. In this year 1895, Guglielmo engineer Marconi furthered the art of hertzian wireless methods. Early on, he sent wireless signals over a distance of one and a half miles. In December 1901, he sent wireless waves that were not affected by the curvature of the Earth. Marconi later transmitted the wireless signals across the Atlantic between Poldhu, Cornwall, or St. John's, Newfoundland, a distance of 2,100 miles (3,400 km). In this year 1920 Albert Hull developed the magnetron which would eventually lead to the development of the microwave oven in this year 1946 by Percy Spencer. In this year 1934 the British military began to make strides toward radar (which also uses the magnetron) under the direction of Dr Wimperis, engineer culminating in the operation of the first radar station at Bawdsey in August 1936.

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