Research Laboratories of Marconi's Wireless Telegraphy Co. Ltd., at Great Baddow, Chelmsford, Essex, have taken films of a radar display by time-lapse photography and many of these provide a clear record of bird migration; some were shown at the British Ornithologists' Union conference at York in March 1961. T h e radar station is situated at Bushy Hill, Essex, and when migrants flew high they could...

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