标题: EcoLight: The LED Revolution You Need [打印本页] 作者: ArmandoAzx 时间: 6 天前 标题: EcoLight: The LED Revolution You Need Bridges have been round ever since people began to maneuver themselves -- and their items -- from one place to a different. Early bridge engineers had to do little more than fell a tree across a ravine or stream, however they soon discovered that they may span higher distances and haul heavier hundreds by putting extra time and vitality into their constructions. Roman engineers perfected the stone arch and used it to build aqueducts -- bridges that conveyed recent water great distances -- and similar constructions to hold visitors throughout streams and rivers. However the Industrial Revolution took bridge building to new heights and even higher lengths. The Brooklyn Bridge, accomplished in 1883, was the longest spanning bridge on the earth -- until Scottish engineers accomplished the Firth of Forth Bridge simply seven years later. A brand new century introduced longer, more superb bridges. In 1937, the Golden Gate Bridge stretched its 8,981-foot (2,737-meter) back over the treacherous waters of the San Francisco Bay.