London : Longman, Rees, Orme, Brown, Green, and Longman · leaf 135
os at g, and which is, in this instance, 11 in. Experiment Second. — The same arch {Jig. 21.), at the point e,carried 4 lb., but it gave way when half a pound more was added.The dotted line e b lies within the voussoirs ; but the dottedline a e, at the point /i, equals 6J in. from the intrados of… … the semicircular arch {^g. 21.) This segmental arch sustainedon the crown, at c, a weight of 42 lb.; but it gave way with aweight of 56 lb., by sinking down at c, and by being forced outat the points d and e\ the voussoirs oX a b were secured frombeing pressed outwards. The dotted line c b almost…
Architecture
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