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Geek Trivia: What Were Planes Detected With Before The Invention Of Radar?

March 29, 2013 Geek, How To

What Were Planes Detected With Before The Invention Of Radar?

1) Ultrasound

2) Pigeons

3) Telescopes

4) Acoustic Mirrors

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by Jason Fitzpatrick via How-To Geek

Geek Trivia: What Were Planes Detected With Before The Invention Of Radar?

Geek Trivia: What Were Planes Detected With Before The Invention Of Radar?

Reviewed by Ossama Hashim on March 29, 2013 Rating: 5

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