I had a friend that had a dual tone model 77 on a 1965 Cadillac combination. It was amazingly different in sound when coming at you. It didn't seem as piercing as the monotone but it was loud and effective. His also had a brake on it as it was a long coasting type siren.Mine would be the Model 77, because it is a dual-tone vehicle-siren
Federal Models 76 and 77 had a stacked rotor which generated a 2nd interval dual tone. I heard only one of these, used by the fire department in Puebla, Mexico, and the reverberation off surrounding buildings is awesome. The 2nd interval has a very strong beat, giving it rather frightening quality. In the sound file collection of this site is a recording of one being run off a large transformer.robert gift wrote:A single dual-tone siren?
Or was it two separate sirens?
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