Westminster Bridge - This bridge was begun in 1739, and was finished in 1750.  Its length is 1230 feet by 44 in breadth, and it has 15 arches.  Though its construction is simple, it possesses great elegance.  The middle arch in 76 feet wide, and the others diminish regularly four feet on each side.  The expence of building this bridge, amounted to 389,500l.