http://www.youtube.com/watch?v=GDzXe3ZNdAU
This is the 3rd Wednesday of the month noon test of the sirens in Dickson County, TN. This particular siren is a Federal Signal Model 7 (7.5hp) Tornado Siren located behind the Burns Volunteer Fire Department. Listen closely before the siren starts up and you will be able to hear the Sentry 16V1T-B at the Industrial Park going off in Alert mode.
This siren appears to be a 70's model, and still runs strong (and very loud) to this day. It is currently used for Fire and Medical calls, as well as tornado warnings.
Big thanks to the guys at the station for the info and tour of the other parts of this monster!