London : Longman, Rees, Orme, Brown, Green, and Longman · leaf 429
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… … This last experiment with the segment of a circle correctlyconfirms what was observed of that form of arch when treat-ing of the extrados of the ellipse and cycloid, as given inEssay I. The Gothic and Roman arches of equal spans, being placedon piers of the same dimensions of base, balance as…
Architecture
Internet Archive · Public Domain Mark 1.0. Free to use for anything.
![An illustration from Libro primo [-quinto] d'architettvra ... (1566)](https://img.insideoutlibrary.com/img/200/ia-libroprimoquinto00serl-277-335.webp)
