London : Longman, Rees, Orme, Brown, Green, and Longman · leaf 123
practically explained to the Gerieral Reader. Ill and it is drawn by making the profile, or rounded edge, thesegment of a circle. The torus {Jig.4:S.) is like the astragal, but of much largerproportion ; and, from its rope-like appearance, it seems to bindand strengthen the parts where it is used.…
Architecture
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