Stones for Building and Decoration, Volume 25

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Page 231 - Saudstoiies are composed of rounded and angular grains of sand so cemented and compacted as to form a solid rock. The cementing material may be either silica, carbonate of lime, an iron oxide, or clayey matter. Upon the character of this cementing material, more perhaps than upon the character of the grains themselves?, is dependent the color of the rock and Its adaptability for architectural purposes. If silica alone is present the rock is light colored and frequently so intensely hard that it can...
Page 92 - The most interesting building material in the entire state of Maryland is the " Potomac marble," " calico rock " or " Potomac breccia," which has been used occasionally for the greater portion of the century.
Page 315 - ... balls let fall from a considerable height. With such difficulties as these to contend with it is not surprising that the building should have been considered a wonder when completed, and that people coming to Boston from a distance made it a point to see and admire this great structure. The wonder, however, was not that the granite could be broken into shape by such methods, but "that stone enough could be found in the vicinity of Boston fit for the hammer to construct such an entire building....
Page 359 - ... of columns and other blocks of stone that were quarried at the time of the erection of St. Paul's Cathedral in London, and which are now lying in the island of Portland, near the quarries from whence they were obtained. These blocks are invariably found to be covered with lichens, and although they have been exposed to all the vicissitudes of a marine atmosphere for more...
Page 263 - As regards color, the stones may be divided into two classes, called buff and blue. The buff stone is above the line of perfect drainage, and in the section above given, this extends as far down as the two feet of bridge stone, forming a total depth of twenty-three to twenty-seven feet. In most of the Amherst quarries the relative amount of buff stone is
Page 304 - An important feature of these joints, as mentioned by this authority, is the direction in which they intersect each other. In general they have two dominant trends, one coincident on the whole with the direction in which the strata are inclined from the horizon, and the other running transversely at a right angle, or nearly so. The first are called "dip joints...
Page 111 - It is as a rule very hard to work, and, as exhibited in the capitol at Albany, the surface is often disfigured by irregular cavities and flaws •which are rather unsightly. The color is said to fade on exposure to the weather, and hence the stone is used mostly for interior work. An excellent outcrop of this marble occurs on the shore of Mallet's Bay, in the town of Colchester. The strata at this point .are nearly horizontal, and in many places form the banks of the lake. One of the best quarries...
Page 194 - Boston as early as 1737, but it was not until the early part of the present century that its use became at all general.
Page 48 - Up to 1867 some 2,020 tons had been quarried and sold. In this latter year some 3,700 stoves were manufactured by one company alone. The business has been conducted upon a large scale ever since. The bed has been followed some 400 feet, and the present opening is some 40 feet wide, 80 feet long, and 80 feet deep. Other beds constituting a part of the same formation occur in Weare, Warner, Canterbury, and Eichmond, all of which have been operated to a greater or less extent.
Page 63 - ... in Blanford and another in Pelham, in the southwest part of the town. The color of this last is dark, and the quantity of the talc is considerably large. A large bed occurs in connection with soapstone on the north side of Deerfield River, in Zoar, near the turnpike from Greenfield to Williamstown. Specimens from this place resemble those from the celebrated localities of this rock at Zoblitz, in Saxony.

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