Transactions of the Institute of British Architects of London (1835)
Royal Institute of British Architects · London · leaf 72
re, the rid^e ribs can no longer be horizontal, and their form is in fact determined by the intersections of the arch ribs, so that uhen the dimensions of the jiarallelo- gram which is to be covered by each severy of tlie vault, and also the curve of the rib, are given, the form of the ridge rib… … and Ag is equal to a g, consequently a u is the portion of arch curve occupied by the rib A G, whence gL is the height of the ridge rib at g above the impost plane. In like manner ac (equal to a e) shows c/n to be the quantity of arch curve occupied by the rib ae, and thence cn is the height of the…
Architecture
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