The Civil engineer and architect's journal, scientific and railway gazette (1839)
London : [William Laxton] · leaf 366
re is aperforation left both above and below the centre crossing, and thevertical pieces cross the horizontal ones at a distance of 5 inchesinwards from their extremities; another perforation occurs when twoblocks are banded together; these perforations diminish the weightof the fabric very much,… … The whole structure consists of 6 ribs placed 6 feet apart, eachcontaining 105 of tliese blocks, built on each other, like the voussoirof a stone arch. The abutments are of stone 24 feet thick, 42 feet inbreadth at bottom, and 37 feet at top. The span of the arch is 23G feet, with a versed sine or…
Architecture · Civil engineering · Science
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