Zet je hoed op soldaat! (according to google translate)
Put on your hat soldier!
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Another “sound mirror” near London :
Another interesting sound-related device : https://www.youtube.com/watch?v=xrSSArQoFWc&t=29s
H.P.
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Love this photo of Japanese sound locators, “War Tubas”
This Youtube of serviing British designs may be of interest
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Now that I’m 73 and my hearing is such that I’m forced to wear hearing aids, my little furry friend acts as my alarm when I’m in my basement hobby cave. She alerts me to any visitors long before they hit the bell. Gives me a chance to peak out and see if I want to ignore them! LOL
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