Inside the siren was a 1952 180-hp V8 Chrysler HEMI ... stage air compressor with a rotating chopper that pushed the air through horns. When the chopper sliced the air being output by the engine ...

For this project, instead of trying to quiet his blower, he decided to make one as loud as possible in the form of an air raid siren. The basic idea behind [Matthias]’ air raid siren is to make ...

"The siren tone that we heard on Saturday, this week, is what we call the attack mode," said Eric Rasmussen, director of ...

Air-raid siren sounds the warning. Air-raid sirens first sounded the warning in London in September 1939. They became an almost daily part of life in the capital a year later during the height of ...