Anyone have a carbide cannon? I'd like to know where to but one. They would be great safe legal noise makers with July 4th coming up. I had one as a kid but would not know where to get one today. Welding supply houses used to sell the cannons and the calcium carbide. They make a bang like a 10 gauge shotgun. Mine had a small can in which you put some calcium carbide and water. a rubber hose carried the acetylene gas generated to a combustion chamber made of pipe and closed on the rear end. It was ignited by a lighter like flint inside that was connected to a trigger. I'd like to find one again if anyone knows who sells them. they're perfectly safe for kids. When I was about 9 I was a nasty little kid out with my cannon waking up the neighborhood at dawn on the 4th of July.