London : Longman, Rees, Orme, Brown, Green, and Longman · leaf 276
ting its force in an improperdirection : thus an arch of thisdescription can never exert itsthrust in the direction of thebridge, but is endeavouring topush the abutments obliquely. To get the thrust stricdy correct, I have supposed the archto be cut into two rings of equal thickness (see^y^-.… … 256 Constructioti qfSAexv Arches.
Architecture
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