Originally posted by: Rubycon
I've read stories that the Chrysler Air Raid Siren can create vibrations that caused nails to pull right out and boards to fly off fences nearby. The vibrations if right next to the horns could make wood smoulder...
So if you have one handy (they are quite rare even in non running order!) you could or just build on the principal and
make a large vibrator. Perhaps a few large aluminum bastards slightly off zero beat running off an Ar tank at 2000 psig. The SPL would be over 150 dB at 50 feet (with the bastards humming) so the neighbors may not like it. Not to mention the windows it would break. But it would sure be funny.