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perpendicular bisector

The perpendicular bisector of a line segment AB is the straight line perpendicular to AB through the midpoint of AB.

Gothic architecture

Gothic architecture   Reference library

The Grove Encyclopedia of Medieval Art and Architecture

Reference type:
Subject Reference
Current Version:
Art & Architecture, History, Early history (500 CE to 1500)
32,319 words

...the latter two from their distant prototype is the adoption of large-scale fan vaults. This feature was unique to England and perhaps the single most original component of Perpendicular, extending the old Rayonnant identity of masonry and window tracery to its logical conclusion. Each rib cone, decorated with regular spokes of bifurcating tracery, exactly resembles in plan a bisected rose window. Their expense and structural indeterminacy confined fans at first to such small enterprises as porches, towers, cloister walks (the earliest extant examples are in...