London : Longman, Rees, Orme, Brown, Green, and Longman · leaf 136
e, which is pei--pendicularly over the weakest part of the arch on this side, someweights were placed, and the arch was found just to balance with14 lb.: the brickwork consisted of fifteen wooden bricks, eight ofwhich weighed 1 lb. The dotted line e b, in the diagram, isalmost without the voussoirs… … over the crown at c, this arch, of twelve voussoirs, just balancedwith 21 lb., placed, as before, at e. The number of wooden brickson each side of the arch was fifteen, and four on the top ; making,in all, thirty-four, eight of which weighed 1 lb. ITie dotted linea e, at h, is only | in. from the…
Architecture
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