why do Charcol burners cover the wood with soil during burning
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The alternative to digging a pit is to stack the wood above the ground and cover the stack with earth. This method is also very old and is widely used in many countries. One finds many variations of the basic method. Studies have been made in some countries to optimise the design. The Swedish work in this area some years ago is notable.
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The other is to cover a mound or pile of wood on the ground with earth (5, 12, 16, 19, 20, 21, 28). The earth forms the necessary gas-tight insulating barrier behind which carbonization can take place without leakage of air, which would allow the charcoal to burn away to ashes.
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