A hail cannon is a pseudoscientific device and purported shock wave generator claimed to disrupt the formation of hailstones in the atmosphere. A mixture of hailstones by creating shock waves. A mixture of acetylene and oxygen is ignited in the lower chamber of the machine and as the resulting blast passes through the neck and into the cone, it develops into a shock wave.
This shock wave then travels at the speed of sound through the cloud formations above, a disturbance which manufacturers claim disrupts the growth phase of hailstones.
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Hail canons are still being built and used by farmers all over the world. They make a very interesting sound as the vortex moves through the air.
http://youtu.be/vqs5LzpySFg
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