Eaeque trabes conpactiles ponantur ut eam habeant crassitudinem, quanta summae columnae erit hypotrachelium, et ita sint conpactae subscudibus et securiclis, ut conpactura duorum digitorum habeant laxationem.
And these coupled beams are to have a thickness equal to the hypotrachelium at the top of the column, and they are to be so coupled with dowels and mortices that the coupling allows an interval of two inches between the joists.
final_alignments\Vitruvius_Architecture_Book_4.json