Now I'm having second plans: I found out that the small chuck on our wood-lathe spins fast enough to make quite some noise when our air-compressor blows air against it, so I might blast my primitive siren for the New Year, though it is late tonight, so I will have to look for ways to get the most sound out of it tomorrow.
EDIT: I've got the lathing machine set up in my room, along with the hose for the air, which nearly just whipped my face when I disconnected it from the compressor by pulling the ring on the brass connector joint, along with making my ears ring.

Now all I need is to bring the compressor up to my room, which is surprisingly heavy for its size! I'll make a video of the siren blasted at New Year's eve.
Update: man, did the test go well!
Though the camcorder makes it look quiet, you could hear this beast from across the street!! This thing was wild. Happy New Year!