London and Malta, April 2012

This is the Parabolic Wall. Sound from aircraft approaching from the direction of Sicily was focussed by the wall to microphones which measured the direction to within +/- 2.5 degrees at a range of 21-37 miles. Similar facilities were built in southern England but were superseded by radar.
This is the Parabolic Wall. Sound from aircraft approaching from the direction of Sicily was focussed by the wall to microphones which measured the direction to within +/- 2.5 degrees at a range of 21-37 miles. Similar facilities were built in southern England but were superseded by radar.
April 26, 2012
Edgar Durbin