Praeterea introrsus contra terrenum coniuncta muro serratim struantur, uti singuli dentes ab muro tantum distent, quanta altitudo futura erit substructionis; crassitudines autem habeant dentium structurae uti muri.
Further, against the earth on the inside, the wall must have projections like the teeth of a saw, such that the intervals between them are equal to the height of the substructure. The thickness of the teeth must be that of the main wall.
final_alignments\Vitruvius_Architecture_Book_6.json