Bridges_notes

**bridge(s):** A link or connection between two objects - usually places either side of an obstacle, such as a river, chasm, or estuary.dge:

__Types of Bridges__



What are the benefits of bridges?
Some of the benefits of bridges are obvious: supplies of food and traded goods can get across an obstacle or through difficult terrain in a shorter time.

The materials used to make bridges are:
Wood, stone, brick, cast iron, wrought iron, steel, concrete, aluminum, and others. The most important material is stone.

Bridge construction technology, steel bridges were riveted together, not bolted, concrete bridges were cast in place, not precast; and large bridge members were built from lacing bars and smaller sections, not rolled in one piece.

http://en.structurae.de/structures/stype/index.cfm?id=1