Model 3

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C1 1/2
A C1 1/2 located in Parsippany, NJ.
Company Federal Signal Corporation
Produced 1929 - May 1967
Type Electromechanical
Sound output 105 dBc at 100 feet
Frequency 533 (12-Port) 460 (8-Port) Hz
Horsepower 3
Succeeded by Model 2

The C1 1/2 or most commonly known as the Model 3, not to be confused with the C2 1/2 which had a 2 inch larger rotor, was a 3 horse power, mechanical, omni-directional siren produced by Federal Signal Corporation part of the Fedelcode lineup. It's essentially the smaller version of the Model 5. The rotor is 13 inches in diameter which came in 2 different port ratios: 12 and 8-port single tone only. No dual tone versions of this siren were available. The siren was housed in a very simple enclosure that resembles an air vent found on building roofs. The C1 1/2 was the least bought model, only marginally louder than the Model 2, which made it not as successful, and was discontinued due to lack of demand as the Model 2 outsold it.