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SOUND MIRROR |
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| UF |
Sound Dish |
| SN | An early warning structure built during and after WWI along the south and east coasts of England. Sound detecting acoustic dishes and walls could detect the sound of approaching enemy aircraft at a distance of 8 to 15 miles. |
| CL |
MILITARY DEFENCE AND FORTIFICATION |
| BT | PASSIVE AIR DEFENCE SITE |
| NT |
SOUND MIRROR (20 FEET)
SOUND MIRROR (200 FEET) SOUND MIRROR (30 FEET) |
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SOUND MIRROR |
|
| UF |
Sound Dish |
| SN | An early warning structure built during and after WWI along the south and east coasts of England. Sound detecting acoustic dishes and walls could detect the sound of approaching enemy aircraft at a distance of 8 to 15 miles. |
| CL |
MILITARY DEFENCE AND FORTIFICATION |
| BT | EARLY WARNING SITE |
| NT |
SOUND MIRROR (20 FEET)
SOUND MIRROR (200 FEET) SOUND MIRROR (30 FEET) |
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