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its forward movement. Machine for dressing slate-frames. Machine for grinding and polishing school-slates. Slate-peg. A kind of nail used in securing slates on a roof. A slater's nail. Slate-pen′cil. The common irregularly shaped black slate-pencils, once the only kind known, are made in Germany. These have been pretty much superseded in this country by the softer, neater, and greatly superior article, known as soapstone pencils, made from a peculiar stone found near Castleton, Vt. This stone contains over 50 per cent of silica, a large proportion of alumina, and also some potash and iron; and, while having some resemblance to soapstone, more nearly resembles slate in texture and capability of being split readily into plates. In the manufacture of pencils, it is first split into slabs 1 to 2 inches thick, which are then sawn into blocks 6 to 7 inches long and 4 or 5 inches wide. With a thin blade of steel and a hammer these are split into plates about one thir