Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Professor James Sayers (2 September 1912 - 13 March 1993) was an important Northern Irish physicist, who played a crucial role in developing centimetric radar - now used in microwave ovens. He was born on a farm at Corkey in County Antrim. He built a water wheel to provide the farm with electricity. He attended Ballymena Academy. He went to the University of Belfast, then St John's College, Cambridge gaining a PhD. From 1939-43 he conducted research for the Admiralty at the University of Birmingham on centrimetric radar, producing the cavity magnetron. He worked with John Randall and Harry Boot.