London : Longman, Rees, Orme, Brown, Green, and Longman · leaf 424
t balanced with 12 lb. on the crown of the arch. Exper. 6. The pier 4 in. by 4 in. base, the same as in thefourth experiment, and 18 in. high, having four courses ofmasonry over the arch, as shown in the same diagram by theletters a ef, balances with 12 lb. placed on the masonry abovethe crown of… … \y 10 In. thrust of the arch g b c, by the masonry g efc, upon and abovethe arch. Exper. 7. An arch, the segment of a circle, of 12 in. radius,and 10 in. span, just balances on a pier having 4 in. by 4 in. forits base, and 9 in. high. See diagram^-. 159. a be. Exper. 8. The same arch as the…
Architecture
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