Cum camerae politae fuerint, sub eas coronae sunt subiciendae, quam maxime tenues et subtilis oportere fieri videbitur; cum enim grandes sunt, pondere deducuntur nec possunt se sustinere.
When the coved surfaces are finished, the cornices must be carried along the springing below them, and these must be made as light and slender as possible. For when they are large, they settle under their own weight and cannot keep their place.
final_alignments\Vitruvius_Architecture_Book_7.json