Prae caetera interponunt singulos crassitudine perpetua utraque parte frontatos, quos diatonous appellant, qui maxime religando confirmant parietum soliditatem.
In addition to the rest, they insert special stones facing on either front of unbroken thickness. These they call diatonos (through-stones), and they, by bonding, especially strengthen the solidity of the wall.
final_alignments\Vitruvius_Architecture_Book_2.json