"To form the
capital, the foot of the column must be divided into eighteen
parts, and nineteen of these parts is the height and width of
the abaco, half thereof is the height ofthe capital with the
volute, which is therefore nine parts and a half high; one part
and half must be given to the abaco with its cimacio, the other
eigtht remain for the volute, which is thus made.
One of the nineteen
parts is to be allowed from the extremity to the inside of the
cimacio, and that place where the point was made, a line must be
fall perpendicular, which divides the volutain the middle,
called catheto. And where the point is upon the line which
separates the superior four parts and a half from the inferior
three and half, the center of the eye of the voluta must be
made, whose diameter is one of the eight parts. And from the
said point a line must be drawn, which intersecting with the
catheto at rectangles, divides the voluta into four parts.
Then a square ought
to be formed in the eye of the voluta,..."
THE FOUR BOOKS OF
ARCHITECTURE - FIRST BOOK, Chap. XVI, Of the Ionick Order - Andrea