(metallurgy, Northern England, Scotland) A piece of cast-iron which lies across the hearth with its ends resting between the keystones, and which can be moved toward the front or back of the hearth as required.
(metallurgy, Northern England, Scotland) A piece of cast-iron which lies across the hearth with its ends resting between the keystones, and which can be moved toward the front or back of the hearth as required. It is a part of the small rectangular furnace called the "ore-hearth," used in the smelting of lead.
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(UK, chiefly, Scotland, obsolete) Cast iron.