Bell Telephone Labs' "Big Bertha" Siren - Specifications
 

Years of Manufacture:

 1941

Manufacturer:

 Bell Telephone Laboratories

Power Plant, Blower:

 Ford 95HP Flathead V-8 Gasoline Engine

Power Plant, Rotor:

 Wisconsin 20HP 4-Cylinder Gasoline Engine

Blower:

 American Locomotive Co.
Centrifugal Compressor
5 PSI

Projectors:

 Six

Sound Output:

 137 dB at 100 feet
Single Tone, 440 Hz (at 4,400 RPM)

 

 

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