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This will produce a vessel able to hold 4 US gallons. We cast this around a wooden box model placed upside down within a waxed cardboard form. We poured in three stages. The first pour put minimum pressure on the cardboard and secured it and the wooden form in place. The second and third went with no issues. The mold, after drying, weighs about 50 lbs. We tried several times to slip cast the vessels but so many issues arose that it turned out to be far easier to slab-build them (by pressing the slabs into it and joining the corners using traditional methods).
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Make a mold for 4-gallon stackable calciners
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