Sin autem excavabuntur, sic est forma facienda, ita uti quam magnum est intervallum striae, tam magnis striaturae paribus lateribus quadratum describatur; in medio autem quadrato circini centrum conlocetur et agatur linea rotundationis, quae quadrationis angulos tangat, et quantum erit curvaturae inter rotundationem et quadratam descriptionem, tantum ad formam excaventur.
But if the flutes are hollow, we must fix their form in this way: draw a square with equal sides as great as is the width of the fluting. Now in the middle of the square the centre of a circle is to be placed, and let a circle be described which touches the angles of the square; and the curve which comes between the circumference and the side of the square, will give the hollow of the flutes.
final_alignments\Vitruvius_Architecture_Book_4.json