I. C. S. Reference Library: A Series of Textbooks Prepared for the Students of the International Correspondence Schools and Containing in Permanent ... in Their Various Courses; Building Stone, - Tapa blanda

Sinopsis

Excerpt from I. C. S. Reference Library: A Series of Textbooks Prepared for the Students of the International Correspondence Schools and Containing in Permanent Form the Instruction Papers, Examination Questions, and Keys Used in Their Various Courses; Building Stone, Lathing, Plastering

Owing to its hardness and toughness, however, great diffi culty is experienced in working this stone, these qualities making it very expensive to cut and thus preventing its use in fine carving. Nevertheless, it is susceptible of a high polish, which makes a durable finish.

Granite is probably the best stone for foundations, andis extensively used in other positions requiring great strength; it is also put to such minor uses as flagging, thresholds, and water-tables. All kinds of granite are damaged considerably by the action of fire, which causes them to crack badly. They disintegrate at temperatures ranging from 900° to l,000° F. The average weight of granite is about 166 pounds per cubic foot.

Granite is found in the eastern and western parts of. The United States and in Canada, the gray variety occurring principally in the New England States and Virginia, while the red variety, which is usually harder, is found near the Bay of Fundy, on the islands of the St. Lawrence River, in Virginia, near Lake Superior, in Maine, and in many parts of the Rocky Mountains.

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