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Before Radar How Were Air Attacks Detected ?

sent by Jim Smith - jsmith5bn6ada AT netscape DOT net

And you thought the Nike Acquisition Radar was old fashioned!

Before Radar How Were Air Attacks Detected ?


STRANGE ACOUSTIC "EARS"

BEFORE RADAR - LISTENING POSTS


STRANGE ACOUSTIC "EARS"

BEFORE RADAR - ON A SWIVEL


STRANGE ACOUSTIC "EARS"

BEFORE RADAR - GERMAN


STRANGE ACOUSTIC "EARS"

BEFORE RADAR - ON WHEELS


STRANGE ACOUSTIC "EARS"

BEFORE RADAR - ENGLAND

and spotted by Kevin Appert
... in this quiz question: hint - select "Acoustic Mirrors"