the iron one is placed in the same position , and also the one of clay . The brick one is a cubit high , a foot wide on the inside , and one foot two digits long ; at a point five digits above the hearth — which is usually the thickness of an unbaked 2 brick — an iron plate is laid , and smeared… … A — Openings in the plate . B — Part of plate which projects beyond the furnace . has three openings which are one digit wide and three digits long , one is at each side and the third at the back ; through them sometimes the ash falls from the burning charcoal , and sometimes the draught blows…
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