The Tizard Mission

… visual detection was often hampered by the island nation’s overcast skies, and the technological means of spotting aircraft were primitive at best. One scheme involved a massive concrete “sound mirror” that picked up the noise of an approaching engine—unfortunately, though, the device wouldn’t have been able to distinguish between the invading Luftwaffe and a passing British lorry. A technological breakthrough was needed….

Source: Review of “The Tizard Mission” by Stephen Phelps at the Wall Street Journal, 2011-03-12

Amusingly, alongside the review is a link to an article Opinion: Japan Does Not Face Another Chernobyl by a William Tucker. Obviously this isn’t the William S Tucker who was involved in the development of sound ranging!

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