A Treatise on the Building and Ornamental Stones of Great Britain and Foreign Countries: Arranged According to Their Geological Distribution and Mineral Character, with Illustrations of Their Application in Ancient and Modern Structures

Cover
Macmillan and Company, 1872 - 333 Seiten
0 Rezensionen
 

Was andere dazu sagen - Rezension schreiben

Es wurden keine Rezensionen gefunden.

Andere Ausgaben - Alle anzeigen

Häufige Begriffe und Wortgruppen

Beliebte Passagen

Seite 236 - ... any other tertiary group in the solid framework of the earth's crust, whether in Europe, Asia, or Africa. It...
Seite 136 - ... and yet so hard as never to betray the touch or moulder away beneath the steel; and so admirably crystallized, and of such permanent elements, that no rains dissolve it, no time changes it, no atmosphere decomposes it; once shaped, it is shaped...
Seite 150 - The color is that of amber, or rich yellowish brown, of varions shades arranged in folds or wavy parallel bands; sometimes it is beautifully iridescent. The mammillated structure so characteristic of deposits due to filtration or percolation is also not infrequent. This stone was largely employed by the ancient inhabitants of Egypt in the formation of canopi (or jars surmounted by sculptured images of the dog-headed god), in which were deposited the ashes of the dead. Besides these smaller objects,...
Seite 30 - Ansted* states that granite generally contains about 0.8 per cent of water and is capable of absorbing about 0.2 per cent more. In other words, a cubic yard of granite weighing 2 tons contains in its ordinary state about...
Seite 203 - Daniell, who has stated to us that from the results of experiments, he is of opinion ' the nearer the magnesian limestones approach to equivalent proportions of carbonate of lime and carbonate of magnesia, the more crystalline and better they are in every respect.* 1 657.
Seite 179 - ... valuable stones are from India. Some of the pieces of sardonyx used by the ancient engravers for their most important works were of enormous dimensions. At the present day onyxes and sardonyxes are imported from Germany, but their colours are produced, artificially by boiling the stone, a kind of flint, for several days in honey and water, and then soaking it in sulphuric acid to bring out the black and white, and in nitric to give the red and white layers. They are, however, considered of little...
Seite 149 - Egyptian onyx, is composed principally of carbonate of lime, and occurs in large beds among the Tertiary limestones of Blad Recam (marble country), near the ravine of Oued-Abdallah. The old quarries which supplied the inhabitants of Rome and Carthage with the fine translucent marblo used in the interior decorations of thoir houses and monuments were here situatod.
Seite 282 - From the manner in which the buildings and monuments of Italy, formed of calcareous materials, have retained to a wonderful degree the sharpness of their orginal sculpturing, unless disfigured hy the hand" of man, it is clear that a dry and smokeless atmosphere is the essential element of durability. In this respect, therefore, the humid sky and gaseous atmosphere of British towns must always place the buildings of this...
Seite 293 - The Welsh Slate Company, whose quarries are at Festiniog, in Merionethshire, sent several slabs averaging 14 feet by 7 or 8 feet. All the slate from this neighbourhood possesses the remarkable quality of splitting with great facility, and with wonderful accuracy of surface, into thin lamina: or sheets. Some of these thinly divided sheets are obtained 5 to 10 feet long from 6 to 12 inches wide, and not more than the sixteenth of an inch in thickness. They are so clastic as to bend like a veneer of...
Seite 101 - ... in the manufacture of earthenware, but it is no longer worked. For purposes of ornament this elegant stone is well adapted, being moderately soft, but not brittle, and therefore easily worked, while it is sufficiently hard to receive an excellent polish. It was long thought that blocks of serpentine of a large size could not be obtained ; quarries have, however, been opened, and it is found that the size and solidity of the blocks increase with the depth from the surface. There are few spots...

Bibliografische Informationen