After reading Bill Fanning's Death Rays and the Popular Media, I looked at a murky 1937 claim of an official British death ray, supposedly on the authority of Sir Thomas 'Caligula's horse' Inskip, Minister for Defence Co-ordination. That turned out to be not quite what happened. But I was also intrigued by something else Bill said, in the context of other press stories of Air Ministry interest in death ray inventions:
The government made such announcements about 'invisible walls' and 'rays' for two reasons. One was to reassure the public that Britain was safe from air attack in the event of another general European war, the other, according to a press release in July 1945, a deception to cover the real work going on with radar.1
The reason why this intrigues me is that I've long wondered why the British government didn't make more of an effort to promote confidence in Britain's air defences in the late 1930s. Firstly, Britain's air defences were stronger. On Inskip's recommendation the RAF's rearmament priorities from 1938 onwards had been rebalanced to favour fighters more, and the extension of the Chain Home radar system around the coast began in 1939. Secondly, regardless of the actual ability of Fighter Command to intercept and repel enemy bombers, even the mere belief that it could do so would be valuable, given that fear of bombing was in itself thought to be one of the greatest dangers. In my book, I suggested that a greater confidence in air defence was responsible for a scepticism about the knock-out blow from the air in 1938-39, though without really being able to prove this directly.2 Perhaps the death ray debate can shed light on this.