I haven't seen a post on this, so I'm making a quick one. I don't know if you guys have seen this story about an old abandoned Heath Engineering Laboratories Siren.
This is the only video of the siren to have actual audio of the siren as well. (There are several different versions of these videos, as they were seeming produced for intro videos for a town meeting.)
You'll have to fast forward to about 5:56
https://www.youtube.com/watch?v=QnVO4WY4nUM
Does anyone know of any other Heath sirens out there. The video mentions one other on a tower, but I can't ever recall having even heard of one before tonight?