Clinker
In metallurgy, clinker is the term for the material remaining after the process of smelting a metal ore. It may contain ash from the smelting fire, and also the impurities, rock, and unreduced metal oxides. Clinker is used in the manufacture of Portland cement.A clinker is also the name of the rocky glassy object left over from burning coal.
In boat building, clinker is a method of constructing wooden boats by fixing planks to a frame so that the planks overlap each other gaining support from the frame and from adjacent planks.
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