Boot was a physicist who made an outstanding contribution to the successfull application of British science during the Second World War. Working with J. T. Randall in M. L. E. Oliphant's laboratory at Birmingham University, Boot produced the first 10 centimetre radar through the cavity magnetron, a discovery which had profound impact on the waging of war in several important spheres. In the Battle of the Atlantic centimetric radar provided the allies with a means of locating with accuracy, surfaced U-boats in any weather, day or night, and centimetric radar was also decisive in the defeat of the German night bombers in 1943-1944 and in the improvement in the accuracy of the Allies' own night bombing. The cavity magnetron was built by Randall and Boot during the winter of 1939-1940 and developed by research teams in universities, institutions, and government departments in Britain and the USA. Randall and Boot were awarded the Thomas Gray Memorial Prize of the Royal Society of Arts in 1943 for 'improving the safety of life at sea.' Further recognition followed with the award by the Royal Commission for Awards for Inventors in 1949, the John Price Wetherill Medal of the Franklin Institute, PA in 1958 and the John Scott Award of the City of Philadelphia in 1959.