Scapis columnarum statutis capitulorum ratio si pulvinata erunt, his symmetriis conformabuntur, uti, quam crassus imus scapus fuerit addita octava decuma parte scapi, abacus habeat longitudinem et latitudinem; crassitudinem cum volutis eius dimidiam.
When the shafts of the columns are fixed, the proportions of the Ionic capitals are to be conformed to these symmetries: namely, that, adding the eighteenth part to the thickest part of the shaft, the abacus may find its length and breadth; the height of the capital with the volutes, half of that.
final_alignments\Vitruvius_Architecture_Book_3.json