Cum enim extra trabes aut liminum capita arcus cuneis erunt conclusae, primum non pandabit materies levata onere; deinde, si quod vetustate vitium ceperit, sine molitione fulturarum faciliter mutabitur.
For when arches, with their voussoirs, are carried outside the beams and lintels, in the first place the wood relieved of its burden will not sag; in the second place, if it decays in course of time, it will easily be replaced without the labour of shoring up.
final_alignments\Vitruvius_Architecture_Book_6.json