Federal 500 siren
From Infogalactic: the planetary knowledge core
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The Federal 500 is an outdoor warning siren produced by Federal Signal Corporation from 1950 to 1981.
History
File:FEDERAL500.jpg
Federal 500
The Federal 500 was introduced around 1950 as a non-rotating, one-phase, 5 horsepower motor fire siren. A 10 horsepower dual-tone version called the 500T came out in 1954. The 550AT, a double-headed, rotating version of the 500T, was introduced and approximately fifty were manufactured before the model was discontinued in the early 1960s.
