Noun
A hollow water-cooled iron casting in the upper part of the archway of a blast furnace in which the dam stands.
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About five or six inches beneath the tymp, also a little in advance of it, is placed a stone called the dam-stone, which is in the shape of a prism. It is securely fixed by means of a strong piece of iron of a peculiar shape, covering its outer side, and called the dam-plate.