Bascule bridge
Bascule bridges are the most common type of movable span because they open quickly and require relatively little energy to operate, while providing the possibility for unlimited vertical clearance for marine traffic.Bascule bridges have been in use since ancient times, but until the adoption of steam power in the 1850s, very long, heavy spans could not be moved quickly enough for practical application.The fixed-trunnion (sometimes a "Chicago" bascule) rotates around a large axle that raises the span(s).The Chicago bascule name derives from the location where it is widely used, and is a refinement by Joseph Strauss of the fixed-trunnion.[3] The rarer Rall type combines rolling lift with longitudinal motion on trunnions when opening.
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