The above images are taken from another book which I wasn’t quite lucky enough to find… Published by the War Office in 1932, this fascinating book explains how sound mirrors for “acoustic defence” actually work. I could only get my hands on these few image taken from this website, I can’t seem to find a copy of this book anywhere, if anyone knows where I might be able to look at/buy this, please please please let me know! Contact details are right here Thanks!
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