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To load the carbide cannon you begin with about four or five ounces of water and pour
that into the combustion chamber, which is basically a T with the cup at the bottom.
Put the plug in that. Place a couple of granules of calcium carbide in the end of loader and
goes in through the breech, as you tighten the plug in it dumps the calcium carbide into
the water. Which will then form acetylene gas. The cannon is equipped with a sparker,
so after the water's in, you give it a few seconds for the gas to form, turn the sparker...