What is this? Heat Detector?

Anybody know what this is? On the left side there is a horn, in the middle there is a wheel, on the right side there is what looks like a compressed air canister. I think a lot of heat casues the wheel to turn and the horn sounds. Kind of like a rate-of-rise detector. Please help me identify. Thanks .


I found this on E-Bay. He’s selling it as a “Falcon Fire Alarm”. I winder how old it is?