The Siren Board

Over on one of the fire apparatus/fire station picture boards I am a member of, a picture was posted of the old firehouse in Jeterville, VA.... looks like a Denver siren up on a pole... I scrolled down two more pics and the photographer actually took a shot of the siren... what a guy!! Either way, is this a Denver siren??

I think that it might be a Denver siren. It looks as if it has (24) ports. It looks as if it might be losely related to that siren that is on Eric's website.

Nice find!

If It's 24 ports I'll bet the Motor is 1800RPM

If it's a 24-port siren and it runs at 1800rpm, then 1800*24/60=720Hz

It would than sound like a STH or 5

How interesting.
Jury-rigging at its best.

Motor looks hardly powerful enough to power such a large siren.
Looks more like a starter motor.

Is it an AC motor?

What note is 720 Hz?
880 is A

That station roof design looks modern.
But the window looks old.

Thank you,

The rotor does not look that large, so the motor would have a pretty easy time. I'd think that it is an AC motor, as this is a station. I don't think that they'd have a starter motor on a siren.

Yes, I'd expect it to be a.c., but have never seen such a cylindrically-shaped a.c. motor.
I thought the rotor stator pretty large.

I'd like to cover up every other stator port, making it 12 port, and then increase rpm to see if it would be louder.

Robert, increasing RPM makes the pitch higher, not necessarily louder.

It's probably a gas pump motor, seeing that it is sealed. They have to use sealed induction motors to prevent an explosion risk due to arcing in the motor. I have seen several different styles, all being continuous duty.