London : Longman, Rees, Orme, Brown, Green, and Longman · leaf 139
drawn within the voussoirs to b;therefore there was no lateral force sufficient to overturn thevoussoirs between e and o, it being counteracted by the frictionbetween the surfaces of the two bottom voussoirs {e and b). But,when a weight was placed at /, the arch balanced with 28 lb.;consequently, /… … at d and e, and fell down. The arch is 24 in. in span, and thedimensions of the voussoirs are the same, as to weight, as in thepreceding experiments. Tiie arch carried 3 lb. at the point /,but gave way with 4 lb., by being forced out at n. The dottedlines a, Z, at h^ is 4-^ in. from the ijitrados…
Architecture
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