Harry Boot

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Dr Henry Albert Howard "Harry" Boot (29 July 1917 — 8 February 1983) was a physicist who with Sir John Randall and James Sayers developed the cavity magnetron, which was one of the keys to the Allied victory in the Second World War.

He was born in Birmingham, United Kingdom and attended King Edward's School, Birmingham and the University of Birmingham.

While working on his PhD the war broke out. His professor Mark Oliphant had seen the klystron at Stanford University but it produced insufficient power to be useful as a radar transmitter. He assigned John Randall and Boot to the problem. By late February 1940, a much more powerful cavity magnetron had been developed which was fitted in an experimental radar by May 1940. James Sayers later refined the magnetron still further.

Initially Boot and Randall were awarded £50 each for the magnetron for "improving the safety of life at sea" but later Boot, Randall and Sayers received £36,000 prize in 1949 for their work.

After some work on nuclear physics, Boot returned to magnetrons and after the war built a cyclotron at Birmingham. In 1948 he joined the Scientific Civil Service in the Royal Naval Scientific Service, where he worked until his retirement. He enjoyed sailing, owning two boats at Salcombe in Devon.