Deinde tegulae bipedales ex una parte supra marginem canalis inponantur, ex altera parte besalibus pilae substruantur, in quibus duarum tegularum anguli sedere possint, et ita a pariete eae distent, ut ne plus pateant palmum.
Then let two-foot tiles be placed above the edge of the gutter on the one side; on the other side, piers of eight-inch bricks are to be built up, to take the edges of two tiles, and let the piers be distant not more than one palms length from the wall.
final_alignments\Vitruvius_Architecture_Book_7.json