Mechanical exercises, or, The elements and practice of carpentry, joinery, bricklaying, masonry, slating, plastering, painting, smithing, and turning (1812)
Nicholson, Peter, 1765-1844 · London: J. Taylor · leaf 343
are usually so much cut away, that in-stead of giving support, are themselves support-ed by the adjacent filling-in arches. Fig. 5 the centering for an hexagonal GothicGroin, such as are frequently seen in Chapterhouses. Fig. 6 the Piers of an hexagonal Groin, andthe angles obtunded according to… … F,\^.2.
![An illustration from Rudiments of the art of building : represented in five sections [...] for the use of architects, builders, draghtsmen, machinists, engineers and mechanics (1853)](https://img.insideoutlibrary.com/img/200/ia-rudimentsofartof00bull-80-52.webp)
