Whenever I hear the sound of an air raid siren in films or on the television my heart stops and I am transported back to a day in 1949. After the war the local pits bought the air raid warning sirens.

The air raid warning system was developed in 1938/9 ... created by varying the power to the siren. The second was the all clear - a single, continuous note. After it was confirmed the skies ...

The air raid siren produces a particularly distinctive ... Meanwhile, for some background on the Cold War HF relics, have a read about numbers stations.

There was concern that an air-raid siren test in the middle of a storm ... triggering fear by some Chicagoans amid the Cold War. A contemporary Associated Press account indicated that people ...