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<p>He attempted to build a 60 inch <a href="page.php?w=cyclotron">cyclotron</a> at the university, but its completion was postponed by the outbreak of the Second World War in Europe in 1939. He became involved with the development of <a href="page.php?w=radar">radar</a>, heading a group at the University of Birmingham that included <a href="page.php?w=John_Randall_%28physicist%29">John Randall</a> and <a href="page.php?w=Harry_Boot">Harry Boot</a>. They created a radical new design, the <a href="page.php?w=cavity_magnetron">cavity magnetron</a>,</p><p>
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