Mysterious instrument

June 1st, 2008
Mysterious instrument

“Can you guess what these might have been used for – and where?”

Seen at News Scientist

3 Responses to “Mysterious instrument”

  1. Ron Says:

    Audio “radar” used to detect airplanes before radar actually was developed.

  2. Eugene Says:

    Now everyone is talking about the American economy and eclections, nice to read something different. Eugene

  3. iPeter Says:

    My guess is that these were used as alert sirens in the bombing of London during WWII. (?)

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