Web Definition: Bridges
A bridge is a structure built to span a gorge, valley, road, railroad track, river or other body of water, or any other physical obstacle. The purpose of a bridge is to allow passage of people, vehicles, trains or ships over an obstacle. A moveable bridge gives space for tall items such as ships masts to pass through, or may be used to span distances that are variable in height or distance. The first bridges were simple wooden logs or planks spanning a stream or such; the next examples found use stone, but again as a simple support & crossbeam arrangement. The arch was first used by the Roman Empire for bridges & many Roman bridges & aqueducts still exist today. The Romans also had cement, which reduced the variation of strength found in natural stone. Brick & mortar bridges were built after the Roman era, as the technology for cement was lost. During the 18th century, many innovations in the design of timber bridges by Hans Ulrich & Johannes Grubenmann & others.
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