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

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

on March 29, 2013

What Were Planes Detected With Before The Invention Of Radar?

1) Ultrasound

2) Pigeons

3) Telescopes

4) Acoustic Mirrors

Think you know the answer?

by Jason Fitzpatrick via How-To Geek

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