That's a 2nd Generation Federal Electric Type Mach. B, dates are kinda obscured but I'd estimate from around 1920-1923. Here's what they look like up close:

That just a newer-style Federal Model 2. The housing doesn't quite match the siren core; Fedelcode-era 2's had longer legs that put the chopper between the upper 2 skirts.

Uhhh, that MD isn't even gas powered...here's one that is:



https://www.youtube.com/watch?v=hU2BDR6KB90

I want to say Federal gives the Model A a 5 minute duty cycle. I don’t believe the smaller motors used in A’s have a fan for cooling so I’d be hesitant to run it longer than that, and give it at least 15 minutes to cool back down.

What kind of Model A do you have; can you post pictures of the motor? Depending on the motor style you can easily open it up to inspect the innards. If it’s anything later than ~1950s they started to use 2 shells pressed together which makes taking them apart a bit more involved.

Do you happen to have a video of the siren running?

Very interesting. Do you happen to know the relationship between BGE and General Electric here in the states? Since Federal Electric was started as a branch of GE (IIRC), I wonder if they pulled from Federal’s playbook; the design of the 5-mile siren is extremely similar to the early dual-rotor Fede...

Unknown 2HP siren atop the grist mill in Elkader, IA; photo taken in 1925. The siren was installed in March of 1921 to replace a fire bell, and saw its demise in March of 1939 when the mill burned down. The siren was replaced by a Fedelcode Mach. 5 that still serves to this day.

This recording predates the T-128 by many years, plus TMI never had any 3T22’s…

https://cdn.discordapp.com/attachments/1339783747536420944/1342914883754131507/e5ssgtet3x781.jpg?ex=67bb5e72&is=67ba0cf2&hm=c902c3dc08ebf09e6d30d6f4e2e7752c642c74b1bd0cd396a5ec86c7fe539849& It's a Model/Mach 7 *Inhales* NO Please read through the other comments on this thread to underst...