Type of wood-kiln firebox where primary air enters at top of firebox, passes down through wood, and combustion occurs at level of grates or hobs, and is supercharged by the heat of the coal bed.  Heat and flames enter firing chamber below grate-level. In true Bourry-box, wood can be piled above grates and is gravity-fed down to combustion zone. Source: Clay: A Studio Handbook

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