Jack archShallow segmental vault springing from beams, used for fireproof floors, bridge decks, etc.Jacobean
Yorkshire (West Riding) ...
These massive timbers hinted at an important industrial survivor (Illustration), in a city with a remarkable collection of industrial buildings which, since the early 1800's, have been blessed with fire-proof jack arch constructions.
Around the fanlight is an impressive arch made from cut-stone voussoirs and over the windows are the usual jack arches.
flat arch - An arch having a horizontal intrados with voussoirs radiating from a center below, often built with a slight camber to allow for setting. Also know as a "jack arch".
 See also: Floor, Door, Frame, Classical, Gable
  
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