A Treatise on Isometrical Drawing as Applicable to Geological and Mining Plans: Picturesque Delineations of Ornamental Grounds, Perspective Views and Working Plans of Buildings and Machinery, and to General Purposes of Civil Engineering ...
John Weale, 1834 - 239 páginas
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A Treatise on Isometrical Drawing as Applicable to Geological and Mining ...
Sin vista previa disponible - 2020
accuracy adopted advantages afford angle appear application Author axis base bearings buildings called centre circle clear coal colours common considerable construction containing conterminous convenient correct cube curve delineation describe diagonal diameter dimensions direction distance district drawn edges ellipse engraved equal example exhibit explanations extent extremities faces feet figure geological geometrical given ground plan hence horizontal plane illustration important in-isometrical inch interest isometrical drawing isometrical line isometrical projection knowledge lead mines length less manner means measured meridian method miles mineral mining mode nature objects observation operations parallel perpendicular perspective placed plane plans and sections Plate portion position practical present preserving principles protractor radius records reference relative render representation represented respective right line ruler scale side square strata subterranean surface surveys tion triangle true various veins vertical
Página 124 - ... edge of the first ruler; and when the shoulders b and c rest against the edges of the first ruler, the edge of the second should lie along ge, the other side of the equilateral triangle. The second ruler should have a little foot at k for the same purpose as the prominences on the first ruler, and both of them should have their edges divided into inches, and tenths, or eighths of inches. It would be convenient if the second ruler had also another groove rs, so formed that when the shoulders r...
Página 142 - ... that, whatever situation be selected for them, they should be concentrated in one national settlement, where particular attention should be bestowed to keep them distinct and separate, and where their peculiar and characteristic manners should be carefully encouraged. It is much to be regretted, that so little attention has been paid to this principle, not only with respect to the Highlanders, but also the Dutch and Germans, who, in some parts, form a considerable proportion of the colonists....
Página 107 - Corol. 1 . Hence, the square of either of the two less sides, is equal to the difference of the squares of the hypothenuse and the Other side (ax. 3) ; .or, equal to the rectangle contained by the sum and difference of the said hypothenuse and other side (th.
Página 196 - On the north, two woody denes, branching off at a neat farm-house, wind away in different directions through rising pasture grounds, which skirt the borders of the sky; and on the south a mountain stream glides from pool to pool through broad crevices of dovecoloured marble, under a rustic wooden bridge, till it is suddenly thrown aside by a high sandstone cliff, dappled with lichens, and overhung with variegated woods. All this enchanted bowl has sides as chastely ornamented with works of nature...
Página xvi - Such a collection, the plan and description of the district, form together a complete and instructive whole. If our ancestors had left us such documents for two centuries past, or even for half a century, what advantage would it not have been to us ? From what doubts would it not relieve us? With what anxiety do we not turn over the leaves of ancient chronicles in search of information, often very imperfect, obscure, and uncertain ? With what pleasure do we not receive the least sketch or plan of...
Página 1 - that many collieries which are now open will sooner or later be shut up, and lie dormant for various and indefinite periods ; and the probability is, that in many cases all knowledge of the dykes which intersect them may be lost, and that the parties having to re-open them may be as ignorant or even more so than those who first opened them. It is not necessary...
Página 124 - The groove should be of such a size, that when its shoulders, a and d, are in contact with, and rest against the edges of the first ruler, the edge of the second ruler should coincide with de, the side of an equilateral triangle described on dg, a portion of the edge of the first ruler ; and when the shoulders, b and c, rest against the edges of the first ruler, the edge of the second should lie along ge, the other side of the equilateral triangle.
Página xvii - With what pains do we not rake up the old heaps of rubbish brought out of old excavations, to discover pieces which may afford us some idea of the substances which were formerly worked out ? Yet, between these documents, and those which we might obtain in the way pointed out in the preceding paragraphs, there is as much difference as between night and day. Is it not an obligation, a duty, for us to collect and leave to future generations as much instruction and knowledge as possible on the labours...