Civil Defence Training 1960's

[Sapper740]

In 1952 the Chrysler Air Raid Siren used the 180-HP, 331-cubic-inch Chrysler Hemi engine and a three-stage compressor to create the loudest siren (138 dB) ever produced. Its remarkable specifications include a compressor discharge volume of 2,600 cubic feet per minute at 7 psi and a residential coverage area of approximately 16 square miles. In comparison, the electric sirens commonly used today for tornado and tsunami warnings can alert about four square miles.