Tetrastyla sunt, quae subiectis sub trabibus angularibus columnis et utilitatem trabibus et firmitatem praestant, quod neque ipsae magnum impetum coguntur habere neque ab interpensivis onerantur.
The tetrastyle courtyards have angle columns under the beams, which gain thereby in usefulness and strength, because they are not compelled to bear great pressure and are not loaded by the trimmers.
final_alignments\Vitruvius_Architecture_Book_6.json