OCR Text |
Show 1'erroid. A new artificial stone, which can be melted and cast in moulds, is said to be a compound partly chemical and partly mechanical, of iron, sulphur and silicon, with more or less foreign matter. mat-ter. Its Dormal color is a dark slate, which can be modified by pigments. The material has the hardness of blue-none blue-none and can be worked by the usual itone cutting tools, turned la a lathe or planed. The tensile strength is from 650 to 1, 200 pounds per square inch and compression of 9.000 to 10.000 pounds is withstood. The specific spec-ific gravity is about 2.6; the melting about 800 degrees Fahr. The new etone is described under the name of Ferroid. " |