London : Longman, Rees, Orme, Brown, Green, and Longman · leaf 78
here. In fact,if diagonal lines be drawn, equalling the respective perpendicularand horizontal forces of every voussoir, each diagonal line wouldagain be resolved into the above two horizontal and perpen-dicular forces, of which the one representing the latter would beomitted, in consequence of its… … Scale of Force lines d ef. The figures along those lines show the horizontalforces in pounds, and the figures fiom a to 6 denote the perpen-dicular forces in pounds. In this diagram, a h represents onehalf of an arch of 24 in. in diameter, and constructed of tenwooden voussoirs upon which the…
Architecture
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