John A. Roebling
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John Augustus Roebling was a German-born American civil engineer. He designed and built wire rope suspension bridges, in particular the Brooklyn Bridge, which has been designated as a National Historic Landmark and a National Historic Civil Engineering Landmark.
Roebling, c. 1866
A 2006 German stamp commemorating Roebling
The Brooklyn Bridge in February 2007
Roebling's Shop in Saxonburg, Pennsylvania, adjacent to a replica of the Brooklyn Bridge
Wire rope
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Wire rope is composed of as few as two solid, metal wires twisted into a helix that forms a composite rope, in a pattern known as laid rope. Larger diameter wire rope consists of multiple strands of such laid rope in a pattern known as cable laid. Manufactured using an industrial machine known as a strander, the wires are fed through a series of barrels and spun into their final composite orientation.
Inside view of a wind turbine tower, showing the wire ropes used as tendons
Left-hand ordinary lay (LHOL) wire rope (close-up). Right-hand lay strands are laid into a left-hand lay rope.
Right-hand lang lay (RHLL) wire rope (close-up). Right-hand lay strands are laid into a right-hand lay rope.
Right-hand ordinary lay (RHOL) wire rope terminated in a loop with a thimble and ferrule