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  1. #1
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    Acoustic Mirrors

    An interesting article.

    Dave.

    https://www.bbc.co.uk/news/in-pictures-46348917

  2. The Following 8 Users Say Thank You to SG500 For This Useful Post:

    Andysarmoury (7th January 2019), HAZORD (7th January 2019), Lostround (7th January 2019), pzgr40 (7th January 2019), Tmine35 (7th January 2019), wichitaslumlord (7th January 2019), ydnum303 (7th January 2019), Yodamaster (7th January 2019)

  3. #2
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    Very interesting article. Amazing that nearly everybody passing them sees them, but hardly anybody knows what they are and what they're meant for.

  4. #3
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    And here are lots of smaller, portable devices of the same type: https://rarehistoricalphotos.com/air...dar-1917-1940/

    Some of them look hilarious!

  5. The Following User Says Thank You to Tony Williams For This Useful Post:

    SG500 (7th January 2019)

 

 

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