A design for the bridge at New Palace Yard, Westminster, (inscribed to the Right Hon. the Lords and gentlemen, appointed commissioners for building the same) composed of nine arches, independent of each other; whose nature is such, that the greatest weight possibly to be impressed cannot break them down. Admitting 880 feet water-way for the flux and reflux of the tides : Wherein is demonstrated, I. The several manners that the tides will be affected by this building. II. The greatest fall of the water truly calculated; with remarks on an erroneous calculation of 4 inches and seven ...ths, lately published. III. Methods for laying the foundations of the piers in the most substantial and expeditious manner, and to erect them with the same ease as on dry land, without obstruction to the navigation. IV. A near calculation of the cubical feet contained in the whole fabrick; the expence it built entirely with stone, or with stone and brick. V. The great use and advantage of horizontal cylinders, for adjusting an equal pressure on the sides of each arch. A work entirely new, by which an expence of 24,174l is saved, and the building made stronger also. With observations on the several designs published to this time, proving the abutments of their arches to be infirm, and the possibility of their falling, by means of which the whole will be in danger. By B. Langley.