"TMOliver" wrote in message
...

Back in the 1930s, the British built a system of concrete "mirrors"
designed to receive and potentially triangulate the engine noises from
approaching enemy bombers approaching the Scuttled H'aisles.

The idea didn't work, so the boffins chose Radio Detection and Ranging,
better known as RADAR, for their next attempt at success, having
preliminarily abandoned the active bouncing of sound through the air as
requiring really loud "Bongs" instead of the modest whale-disenheartening
"Pings" of ASDIC/SONAR.

Not quite.

The audio ranging things were built AFTER Chain Home was started.

I used to play on one at Skipsey when I was a kid, a very odd experience if
you stood in the wrong place on the acoustic lense.

No evidence that anything electrical was ever connected to them either. No
wires, no conduits, no connections back into the bunkers behind them,
nothing...

--
William Black


I've seen things you people wouldn't believe.
Barbeques on fire by the chalets past the castle headland
I watched the gift shops glitter in the darkness off the Newborough gate
All these moments will be lost in time, like icecream on the beach
Time for tea.




Meanwhile both the British and the dastardly Tschermans kept
"stereoscopic" audio detectors in production and service through the early
war years, busily listening for the drone of approaching bummers.

You too may build your own RDF Loop (and those little US UHF TV antennae
work fine) and buy a receiver to listen to local airport frequencies and
plot "LOP"s for aircraft as they come and go. That's cheaper than
attempting to locate and restore a surplus Gestapo signal
detection/location truck (or one of the UK Post Office signals vans that
could pinpoint your home television set, checking the big ledger book to
see if your license had been paid - must have been very sensitive
receivers).

Every kitchen should have its own SLQ-32.....

TMO