Description of a Series of Elementary Geological Models: Illustrating the Nature of Stratification ... with Notes on the Construction of Large Geological Models

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R.J. Mitchell & Sons, 1875 - 82 páginas
 

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Página 79 - We have only room, at present, strongly to recommend Mr. Sopwith's book, as BY FAR THE BEST, AND INDEED THE ONLY COMPLETE WORK, that has yet appeared on the subject. Every part of it is rendered easily comprehensible, even by a person who knows scarcely any thing of geometry ; and every mode of the application of isometrical drawing is beautifully illustrated by engravings."— ioa<fon'
Página 21 - Transactions of the Natural History Society of Northumberland, Durham, and Newcastle upon Tyne, and noticed inonr V.
Página 2 - ... of Wood, fitted together from actual Measurements of the Strata in the Coal and Lead Mining Districts of the North of England. The upper part of each Model represents the surface of the ground ; the sides exhibit four vertical sections, each of which corresponds with the sections usually drawn in Geological Works, and the base of each Model represents a horizontal plane at a certain depth under the surface, according to the scale of the Model.
Página 79 - ... them the principles that have been detailed : and this he has exemplified in the plates. ^ The correct exhibition of objects would be much facilitated by the use of this perspective, even in the hands of a person who is but little acquainted with the art of drawing ; and the information given by such drawings is much more definite and precise than that obtained by the usual methods, and better fitted to direct a workman in execution.* • The author has transcribed this interesting paper from...
Página 15 - OF DENUDATION. Tyne, Wear, and Tees, in Cumberland, Durham, and Northumberland, may be mentioned. In them, the cropping out, or basset, of the strata is very obvious, and affords peculiar facilities for geological research. . . . To produce such a valley as that represented in the model, it is obvious that a quantity of rock equal to the whole of the upper portion of...
Página 15 - ... dreary aspect which characterizes all the higher portion of the mining district, rendered in moist weather or in winter still more dreary by hanging mists on the summits, or wasting snows scattered over the wide expansive sides of the hills, but from the massive character of the scenery, rendered beautiful and even sublime by the blue shades of evening, or the subdued effect of moonlight...
Página 15 - The bassett of the great limestone, which is the thickest and nearly the highest calcareous stratum, forms, in many instances, the limit of cultivated land and of human habitations. Below it, the hill sides in spring and autumn present a beautiful green surface, and in summer an abundant and flowery produce in the meadows. While on the same hill above the limestone, bare short grass, ling, and moss impart the brown and dreary aspect which characterizes all the higher portion of the mining district...
Página 1 - These models are constructed of various kinds of •wood fitted together from actual measurements of the strata in the coal and lead mining districts of the North of England. The upper part of each model represents the surface of the ground, — the sides exhibit four vertical sections, each of which corresponds with the sections usually drawn in geological works, and the base of each model represents...
Página 79 - ... used to it, I found much better adapted to the exhibition of machinery ; I therefore determined to adopt it, and set myself to investigate its principles, and to consider how it might most easily be brought into practice. It is preferable to the common perspective on many accounts, for such purposes. It is much easier and simpler in its principles. It is also, by the help of a common drawing-table, and two rulers,* incomparably more easy, and, consequently, more accurate in its application ;...
Página 3 - ... to the original formation of rocks, and is confined to such facts as are open to every-day observation, and of the existence of which no doubt can possibly exist.

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