A friend of mine has a shop (business) in an area that is out of town and on a well traveled road with only a few other neighbors around. The shop is rather tall (I think it's 16 feet, or taller, to the rafters) 40' x 60' and part of the upper area is used for storage. In the past, he and his neighbors have had a few problems and were deciding what would be the best solution. He finally came up with an idea and the neighbors were all for it.
Seeing that he is always going to auctions and picking up all kinds of items, it didn't surprise me when I found out that he had finally got the perfect alarm system. He found an old air raid siren that use to be mounted on the tops of city halls. These are the ones that you could hear about 5 to 10 miles away, when they went off.
He mounted it up in the rafters so it was almost out of sight. When he wired it up he ran the wiring from his house so that it was on a seperate circuit from the shop, just in case a theif was smart enough to trip the main breaker in the shop. He also wired it to a 30 to 45 second delay. This way the scumbag had enough time to really get into the shop and away fom his point of entrance. Since his shop is not the cleanest and most well picked up shop around, there is the chance of tripping over stuff, if you're in a hurry.
He did a quick test on it (ran it up close to half speed) and all I can say is you don't want to be anywhere around that buildng, much less inside, when that thing goes off.
If the ear, eye and nose bleeds don't get you, running through a dark shop with machinery in the way trying to escape, definally will.
