Observations on the re-building of London bridge

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Page 130 - ... pressed outwards by the weight of the pier ; a circumstance that generally takes place where piling is employed, and the work heavy. This circumstance is also well known to miners, and is thus described by Mr. Seward : — " If a level be driven one or two hundred yards underground through the solid rock, there will be no danger of its not continuing entire for an indefinite length of time; but if the sides and roof only of the level be formed in the rock, and the bottom be cut through into a...
Page 130 - ... of clay, however strong and stubborn it may be-, being pressed by the weight of the superincumbent rocks, it will imperceptibly swell and rise up in the level ; and, unless it be continually pared down, or prevented by some means, the level will, in no great length of time, be entirely choked up." The masonry of the piers was carried up with horizontal and vertical bonds to the springing, where they radiated in wedge-like courses that received the line of direction, or force of the arch. (See...
Page 98 - ... contain from twelve to twenty barrels, and must not be confounded with the jar by which Cyprus wines are usually sold. Notwithstanding these last, a large proportion of Cyprus wine is transported in skins. Limed vessels, and those of marble, are liable to be acted upon by wine to its great detriment. Before taking leave of this part of the subject, it may not be amiss to mention that colour- has no relation to the time of the must acquiring vinosity. If the quantity in the vat be considerable,...
Page 107 - But it does not appear equally clear that it is necessary to have a reference to the lateral pressure also. On the contrary, I think it may be safely laid down as a principle, — that in determining the depth of the voussoirs of an arch, it is not necessary that the lateral pressure or radius of curvature should be noticed in the first instance at all : for this plain reason, — that if...
Page xii - ON THE REBUILDING OF LONDON BRIDGE; Demonstrating the Practicability of executing the Work of London Bridge in Three Flat Elliptical Arches of Stone, each 230 Feet Span ; with an Examination of the Arch of Equilibrium proposed by the late Dr. HUTTON : and an Investigation of a New Method for forming an Arch of that Description. Illustrated by Seven Plates and other Figures.
Page 27 - Q is a constant quantity, the value of which must be determined by the particular circumstances of the case.

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