The Chrysler-Bell Victory Siren was the result of a collaboration between Bell Telephone Laboratories and Chrysler Corporation that was encouraged in 1942 by the Office of Civil Defense.  Bell developed a new sound generation design that used a direct flow of pressurized air through a chopper rotor and Chrysler put that design into production. 

Chrysler produced three popular air raid sirens based on the Bell design.  The first was called the Chrysler-Bell Victory Siren.  In 1942 one hundred and twenty sirens were sold for a reported $3,760.00 each.  The first orders were for New York City, Detroit and Chicago.

The first and second generation Chrysler sirens used a 140 HP straight-8 gasoline engine and two-stage blower.  Both of these sirens were built in Detroit, Michigan.

Another smaller siren was designed in 1942 to operate off engine exhaust gas.  This siren was called the Chrysler-Bell Gas Siren.  [ Chrysler-Bell Gas Siren History ] 

[ Photographs of the Chrysler-Bell Victory Siren ]