BRIDGES Engineer-It Class Summer 2004 History Primitive Peoples: Logs Slabs of Rocks Intertwined Vines or Ropes Roman Empire—First Great Bridge Builders Timber Truss Bridges Masonry Arch Bridges Europeans Followed HRE Until Iron and Steel Use Nineteenth Century— Modern Long Bridges
Members of a Denver and Salt Lake Railroad Company (D&SL) survey crew pose on a logbridge over the Colorado River in Gore Canyon (Grand County), Colorado.
View of hot springs site enclosed by stone and wooden frame buildings, Hot Sulphur Springs, CO
on the Mesa and Flag Creek road.
Bernard vicinity, Dubuque County, IA
View of a trestle bridge that crosses Arastra Gulch near Silverton (San Juan County), Colorado.
Blue Water Bridge
On June 15, 1907 an inspecting engineer noted that two girders of the anchor was misaligned by a quarter of an inch. Cooper called this a "not serious" problem. In the inspection report in August, 1907, it was noted that the girders had moved out alignment a bit more and "appeared bent". Although this condition was a bit more concerning, the work continued.
A period museum photo shows cranes atop the massive structure. The bridge was constructed from 1882-1890, 2.5 KM (1.5 miles) across Scotland's Firth of Forth. Note reflection of photographer from glass frame.
On the morning of November 7, 1940, the Tacoma Narrows Bridge twisted violently in 42-mile-per-hour winds and collapsed into the cold waters of the Puget Sound. The disaster -- which luckily took no human lives -- shook the engineering community and forever changed the way bridges were built around the world. Roadway of Tacoma Narrows Bridge twisting violently in a windstorm, Tacoma, Washington, 1940
Lifting bridges are moveable bridges which enable boats to pass. They vary from simple wooden designs such as many seen in the Netherlands to large steel structures which carry heavy roads such as the bascule bridge in Docklands.
Buzzards Bay, Massachusetts
Tank destroyer advances along
a mountain road, Italy
Give the type for each.