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Tech journalist since the dark ages. Windows Secrets, LangaList newsletter, Windows Magazine (NetGuide, Home PC), Byte, Popular Computing, yadda yadda yadda. Google me, if it matters.

This feed is mostly personal interest; it's NOT my professional writing. There's tech here, yes, but also lots of general science and some politics and weird humor thrown in.

Thursday, November 20, 2014

Before radar: Giant WW1 and early WW2 "sound mirrors" detected approaching aircraft acoustically

Many sound mirrors were built in England, and later scrapped when radar became available; some are being excavated and restored now.



Story: http://www.independent.co.uk/news/science/archaeology/sound-mirrors--the-earliest-form-of-air-raid-warning--unearthed-on-south-coast-9821837.html

Other, often bizarre-looking, early acoustic aircraft detectors:










If nothing else, perhaps they'd make the enemy die laughing. :)