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A howe truss bridge design includes vertical members and diagonals that slope up towards the center. Its diagonals are under compression under balanced loading. It was invented in 1840 by Massachusetts millwright William Howe. Howe truss design proved to be instrumental not only in the development of several notable bridges at the end of an era of fully wooden bridges but also as an inspiration for the creation of other popular designs.
Beam bridge is the oldest and the simplest type of the bridge. It appeared when the first tree fell over the stream and a human crossed it. Today we still make bridges that use similar principle.
Cable-stayed bridge is a variant of a suspended bridge that is more economic that other types of bridges on middle distances and for middle loads. It also allows for some rather interesting designs.
Footbridge is a bridge for pedestrians. It is often simple (although it doesn't have to be) and its purpose is to take pedestrians over some obstacle like a river, road traffic or a railroad.