Originally Posted by
Genghis the Engineer
Did you see the sound mirrors under the downwind leg, erected during WW1 for tracking Zeppelins and Botha bombers across the Channel?
G
Hate to contradict you Genghis but stories I've read indicate they weren't built until the '30s and were a spectacular failure because they were too sensitive! The slightest sound was concentrated on the microphones, echoed out, then repeated until they had to turn the microphone off.
Then of course radar came on the scene so the project was abandoned.
Bet the RH & DR interfered with it too.