London : Longman, Rees, Orme, Brown, Green, and Longman · leaf 430
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 under: — Relative to the Gothic Arch Jig. 147. — When… … Relative to the Roman Arch Jig. 148.— When the inside ofthe lowest voussoir coincides with the inside of the pier (c <f), asat c, the arch balances on piers 7 in. high, the base measuring2 in. by 4- in. 148
Architecture
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