Turning bridge - A drawbridge that pivots in the middle.
Turret - Small tower, round or polygonal; usually a lookout.
Tympanum - Space between lintel and arch over doorway.
Turning Bridge: a drawbridge that pivoted in the middle
Turret: a small tower rising above and resting on one of the main towers, usually used as a look out point ...
Turning bridge - a drawbridge that pivots in the middle.
Turnpike- a circular staircase - the most economical, if not the most convenient to use, method of accessing upper floors in a vertical tower; also, easier to defend.
Another type worked on the pivot principle, where the inner part of the bridge was moved into a pit while the outer part rose to completely cover the entry, also known as a turning bridge (L. pontem torneicuim). See bascule bridge, hinged bridge.
 See also: Bailey, Drawbridge, Curtain, Timber, Motte
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