London : Longman, Rees, Orme, Brown, Green, and Longman · leaf 441
grams^/^5. 155. and 156. g. This superior strength is to be attributed chiefly to thebeing able to draw a straight line, as c d {Jig. 159.), passingthrough, or rather within, the voussoirs of both arches, from onebuttress to the other; and, if the space between the two arches,just over the pier, be… … 160 however, be remem- bered that the but-tress must be immov-able, or the arches willsupport very little. In the diagramsJigs. 156. and 157.,the greatest height ofthe piers, or pillars,does not exceed 18 in.,which is just twicethe balancing heightof the pier a 6 ofthe Roman arch Jig,150. Now, on…
Architecture
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