>Okay, Tweets, here's what some of you may consider a silly question (but
>too bad, cuz I'm gonna ask it anyway): *What* is an air cannon?!?
>
>What does an air cannon look like? How does one load it? Beyond blasting
>birds, what's its raison d'etre?
>
>---Lisa
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It may be a different gadget; but it sounds like a propane cannon. They're
used a lot at vinyards to scare off robins when the grapes get ripe. It's
just a tube with a propane tank and regulator/igniter. A tiny bit of
propane is injected into the tube and ignited. It's usually put on a timer
to go off every 2 or 3 minutes. It makes quite a noise and usually works on
the birds for a week or so. After that it's pretty much ignored.

John Shelton
Portland, Oregon