London : Longman, Rees, Orme, Brown, Green, and Longman · leaf 429
ents an arch of 24 in. span, and 19 in. high,and composed of twenty voussoirs, each of the weight of half apound, which just balanced on piers of 7 in. in height; the basemeasuring 4 in. by 4 in. The weight of the arch is 10 lb. Theheight, from the base line to the under part of the keystone, is] 9… … The following are comparisons between the different archesof equal span and rise : — An elliptical arch of 24- in. span, and 8 in. rise, just balanceson piers 4 in. by 4 in. base, and 5 in. high. A cycloidal arch of 24 in. span, and 8 in. rise, just balances onpiers of 4 in. by 4 in. base, and 5…
Architecture
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