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Updated: September 24, 2025
I might as well blast it fresh from the quarry. I know the sort of thing those walls of yours are! Vitrified with age, by George! But I don't want to build, and standing the place is of no use to me. I should but let it crumble away at its leisure!"
At Castel-Sarrazin is a camp refuge with similar dispositions, and recently Daubree presented to the Academie des Sciences a piece of porphyry artificially vitrified from the prehistoric ENCEINTE of Hartmannswiller Kopf in Upper Alsace. It is in Scotland, however, that are situated the most remarkable vitrified forts. A few years ago no less than forty-four were counted.
The floor of the valley was fissured and blackened; its patterns, its writings burned away. As far as we could see stretched a sea of slag coal black, vitrified and dead. Here and there black hillocks sprawled; huge pillars arose, bent and twisted as though they had been jettings of lava cooled into rigidity before they could sink back or break.
Davy's reasoning, that a few years ago, after the burning of a large mow, in the neighbourhood of Bristol, a stratum of pure, compact, vitrified silex appeared at the bottom, forming one continuous sheet, nearly an inch in thickness. I secured a portion, which, with a steel, produced an abundance of bright sparks. Upon Mr.
He prosecuted his investigations for a long time with great assiduity, but without success. At length some red clay, brought to him for the purpose of making his crucibles, set him on the right track. He found that this clay, when submitted to a high temperature, became vitrified and retained its shape; and that its texture resembled that of porcelain, excepting in colour and opacity.
Wherever these liquid masses, melted by a heat more intense than can be produced by any artificial means, have flowed over them or cooled in immediate contact with them, the clays will be changed to slate, the limestone will have assumed a character more like marble, while the sandstone will be vitrified.
The sand on which we walk is evident proof that the earth has been vitrified, and that our globe is really only a glass ball, just as are our ideas. But if fire has changed our globe, water has produced still finer revolutions. For you see clearly that the sea, the tides of which mount as high as eight feet in our climate, has produced mountains of a height of sixteen to seventeen thousand feet.
Ready-made tanks are to be had of steel, concrete, or vitrified tile. When it was delivered, two husky truck-men placed it at the edge of the pit prepared for it by the waiting plumber. They exhibited some curiosity and the plumber explained briefly about the bacteria and its action.
"All this being so, you believe in the results of Chemistry, although that science still knows no way of gauging the changes produced by the flux and reflux of substances which come and go across your crystals and your instruments on the impalpable filaments of heat or light conducted and projected by the affinities of metal or vitrified flint.
The retaining walls were water-proofed with three layers of felt and coal-tar pitch, which was protected by 4 in. of brick masonry. A 6-in. vitrified drain pipe was laid along the back of the wall, with the joints open on the lower half, and this was covered with 1 ft. of broken stone and sand before any back-fill was placed on it.
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