The death ray men
…er (London, New York and Melbourne: Hutchinson & Co., n.d. [1943]), chapter 16; 15 and 16 are from David Zimmerman, Britain’s Shield: Radar and the Defeat of the Luftwaffe (Stroud: Sutton, 2001), 45-7. The others are sourced as indicated. The dates given are usually when the claim was made public, though in some cases it’s when the invention took place. Some of these are no doubt duplicates — Barwell doesn’t give many details in most cases — on th…