The Applications of Geology to the Arts and Manufactures: Being Six Lectures on Practical Geology, Delivered Before the Society of Arts, as a Part of the 'Cantor' Series of Lectures for 1865

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R. Hardwicke, 1865 - 300 Seiten
 

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Seite 68 - Dr. Cartwright invented his powerloom in 1784 ; but it is only since the commencement of the present century that weaving by machinery has become general. Steam was first applied as the moving power for the spinning machinery in 1785; in which year Messrs. Boulton and Watt erected one of their rotative engines for a factory belonging to the Messrs.
Seite 143 - 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 27 - ... matter. The earth would bear a constant succession of crops of the same kind, if the mineral ingredients removed by one crop were supplied in the same state from year to year. But this could only be done as the result of a nice calculation, and by careful and systematic farming. As a remarkable...
Seite 142 - An average granite may be expected to contain from two to three fifth parts of crystals of quartz or crystalline quartz ; about the same, more or less, of felspar, also partly crystalline and chiefly in definite crystals ; and the remainder (one-tenth part) of mica. But the mica may form two or...
Seite 30 - ... every year, the annual diminution of produce under their influence -was proportionally less during the latter half of the last twelve, than of the whole nineteen years of their use ; that where ammonia-salts and all mineral constituents, except silica, were liberally supplied every year, the produce of corn increased, and that of...
Seite 38 - England." (This corresponds with the Eocene or Green-sand of South Carolina.) " The former contain beds consisting of nodules of exceedingly hard material, which, when ground, are soluble in sulphuric acid, and then form a most valuable manure. The proportion of Phosphate of Lime in these nodules varies from 50 to 60 per cent.

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