London : Longman, Rees, Orme, Brown, Green, and Longman · leaf 277
256 Constructioti qfSAexv Arches. … developement of a surface midway between the extrados andsoffit or intrados. Upon this intermediate developement I place the approximateline, and then draw all the courses square to it; by which meanswe obtain a line in the centre of each stone exerting its force inthe true direction, and thus get…
Architecture
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