Denge sound mirrors(PID:25711323221) Source
posted by Larigan alias larigan. on Tuesday 15th of March 2016 10:06:21 AM
Lying in an inaccessible gravel pit are three well preserved examples of obsolete technology from the 1920s. They are acoustic mirrors designed to pick up the sound of approaching aircraft before they were visible. They were never taken into use because of the development of radar prior to World War 2. here are the 20 foot and 30 foot sound mirrors.
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- Published 01.24.22
- Resolution 1024x768
- Image type jpg
- File Size 245261 byte.