London : Longman, Rees, Orme, Brown, Green, and Longman · leaf 440
iameter was substituted for the board, the four arches, also,balanced with 4 lb. on the top. On comparing these experiments with the two numbers 4 ofthe two preceding diagrams {Jigs. 156. and 157.), it will be seenthat in both instances the arches just balanced with the sameweights of 2^ lb. placed… … Vr- 1 1 1 1 Fig. 159. represents experiments with two flat arches of equalspan, each composed of six voussoirs; and spanning nearly 12 in.The pier, which was 1 in. thick, and 18 in. high, being com-posed of a piece of board of the dimensions of 1 in. by 4 in., and12 in. high. Three 1 in. by 2 in.…
Architecture
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