Stones for Building and Decoration

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Page 245 - 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 53 - Serpentine is essentially a hydrous silicate of magnesia, consisting when pure of nearly equal proportions of silica and magnesia with from 12 to 13 per cent, of water. The massive varieties quarried for architectural purposes are always more or less impure. containing frequently from 10 to 12 per cent, of iron...
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.
Page 341 - ... apparatus is attached by a swivel to a perpendicular guide-bar. This guide-bar is secured to the boiler behind it, which forms the main support of the machine. Upon the guide-bar the boring apparatus may be raised or lowered at pleasure, for the purpose of boring a series of holes in a perpendicular lino if desired.
Page 110 - There are three beds of marble running through the town, north and south. The most easterly has a breadth of some 200 feet, and the stone is of the same character as that at Sutherland Falls or Proctor, as the town is now called. The middle bed is separated from the first by about 200 feet of lime rock. The bed itself is some 400 feet wide, and the stone varies in color from pure white to dark blue. The third or west bed which is thought to correspond to that of West Rutland is about half a mile...
Page 434 - Divisional planes that divide the rock in a quarry into natural blocks. There are usually two or three nearly parallel series, called by quarrymen end joints, back joints, and bottom joints, according to their position. (2) In coal seams, the less pronounced cleats or vertical cleavages in the coal. The shorter cleats, about at right angles to the face cleats and the bedding plane of the coal. Jud.— (1) A portion of the working face loosened by "kirving" underneath, and " nicking

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