Parabolic arch
An arch shaped like a chain suspended from two level points, but inverted.ParapetWall for protection at any sudden drop, e.g. on a bridge, or at the wall-head of a castle where it protects the parapet walk or wall-walk.
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Hyperbolic paraboloid roof - A special form of double-curved shell, the geometry of which is generated by straight lines. This property makes it fairly easy to construct. The shape consists of a continuous plane developing from a parabolic arch ...
 See also: Church, Arch, Moulding, Brace, Ornament
  
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