Floating-BRIDGE, is ordinarily made of two small bridges, laid one over the other, in such manner, as that the uppermost stretches and runs out, by the help of certain cords running through pulleys placed along the sides of the under-bridge, which push it forwards till the end of it joins the place it is designed to be fixed on. When these two bridges are stretched out to their full length, so that the two middle ends meet, they are not to be above four or five fathoms long; because, if longer, they will break. Their chief use is for surprising out-works, or posts that have but narrow moats. In the memoirs of the royal academy of sciences we find an ingenious contrivance of a floating bridge, which lays itself on the other side of the river.