Four-bar linkage
A four-bar linkage or simply a 4-bar or four-bar is the simplest movable linkage. It consists of four rigid bodies (called bars or links), each attached to two others by single joints or pivots to form a closed loop.
Four-bars are simple mechanisms common in mechanical engineering machine design and fall under the study of kinematics.
read more in: http://en.wikipedia.org/wiki/Four-bar_linkage
Catenary
In physics and geometry, the catenary is the curve that an idealised hanging chain or cable assumes when supported at its ends and acted on only by its own weight.
read more in : http://en.wikipedia.org/wiki/Catenary
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