London : Longman, Rees, Orme, Brown, Green, and Longman · leaf 431
s, 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 projects within the pier,… … reduced to 6 in. in height, it will carry 3 lb. well, or twice theweight of the pier of six bricks. Relative to the Roman Arch Jig. 150. — This arch balanceson the pier a b, which is 9 in. high ; having the same base asJig. 149. The arch projects within the pier, at a, half an inch. 150
Architecture
Internet Archive · Public Domain Mark 1.0. Free to use for anything.
