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4.5-metre-high (14 ft 9 in) WW1 concrete acoustic mirror near Kilnsea Grange, East Yorkshire, UK. The pipe which held the "collector head" (microphone
4.5-metre-high (14 ft 9 in) WW1 concrete acoustic mirror near Kilnsea Grange, East Yorkshire, UK. The pipe which held the "collector head" (microphone) can be seen in front of the structure
Acoustic mirrors at RAF Denge
Acoustic mirrors at RAF Denge
A parabolic whispering dish that's part of an installation at Jodrell Bank Observatory.
A parabolic whispering dish that's part of an installation at Jodrell Bank Observatory.
A pair of smaller acoustic mirrors in a park in Muiderberg.
A pair of smaller acoustic mirrors in a park in Muiderberg.
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The Whispering Gallery of St Paul's Cathedral, London
The Whispering Gallery of St Paul's Cathedral, London