This strange object was built on the coast of Great Britain. What is it?

sun clock
storm detector
acoustic mirror
emergency radio receiver
Prior to World War II and the in­ven­tion of radar, acoustic mirrors were built as early warning devices around the coasts of Great Britain, with the aim of de­tect­ing airborne in­va­sion­s. The de­vel­op­ment of radar put an end to further ex­per­i­men­ta­tion with the tech­nique.

Answers distribution

sun clock
storm detector
acoustic mirror
emergency radio receiver
answers
flagFinland
0%
0%
100%
0%
50
flagItaly
0%
1%
98%
0%
64
flagBulgaria
7%
0%
92%
0%
13
flagCzech Republic
5%
5%
88%
0%
17
flagthe United Arab Emirates
9%
0%
87%
3%
32
flagGreece
6%
0%
87%
6%
16
flagSpain
0%
9%
86%
4%
22
flagGermany
9%
4%
75%
9%
183
flagthe Netherlands
11%
6%
75%
6%
44
flagPoland
10%
6%
73%
9%
11013
flagRepublic of Ireland
10%
6%
72%
10%
29
flagNorway
18%
4%
72%
4%
22
flagthe United Kingdom
14%
6%
69%
9%
495
flagUnknown
15%
2%
67%
12%
70
flagthe United States
12%
6%
66%
13%
232
flagCanada
14%
0%
57%
28%
14
flagLithuania
0%
14%
57%
28%
14
flagFrance
22%
0%
55%
22%
18
flagRwanda
42%
14%
28%
14%
14
flagIndia
28%
19%
26%
23%
63

Gender

men79%
women75%
sun clock
6%
9%
storm detector
5%
5%
acoustic mirror
79%
75%
emergency radio receiver
8%
8%

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This strange object was built on the coast of Great Britain. What is it?
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