London : Longman, Rees, Orme, Brown, Green, and Longman · leaf 430
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 … Again, the same two arches, being placed with the intrados oftheir lowest voussoirs at a certain distance within the line of thepiers, balance as follows : — Relative to the Gothic Arch Jig. 149. — This arch balanceson the pier a b, which is 12 in. high, having 2 in. by 4 in. forthe base. The arch…
Architecture
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