DOI Page / Citation link:
https://doi.org/10.11588/diglit.62828#0199
( 139 )
This method has been adopted in the diminution of the
Ionic, Compofite, and Corinthian columns in Plate X, XI, and
XII; becaufe thefe are the moft delicate orders.
But, in the Tufcan and Doric fhafts, I have followed the
common method; becaufe thefe robuft columns will admit of
more apparent, or more fudden diminution than the other
three.
The moft common method is as follows. See Plate VIII.
Divide the fhaft into three equal parts, and draw a diameter
at the firft part. On this diameter defcribe a femicircle, and di-
vide the femidiameter into five equal parts. From the fourth
divifion raife a perpendicular line which determines the upper
diameter and cuts off a portion of the femicircle, which is to be
divided into four on the curve. Laftly, divide the upper two
thirds of the fhaft into four equal parts, anfwerable to the four
equal parts on the curve; and from each of thefe divifions, or
parts, on the curve, draw right lines to the correfponding divi-
fions on the fhaft, by which, four points will be found through
which the diminifhing curve line is to pafs, and, if accurately
drawn, will appear fmooth. Obferve, this diminution brings
the column, at its fuperior diameter, to forty-eight minutes;
S 2 but
This method has been adopted in the diminution of the
Ionic, Compofite, and Corinthian columns in Plate X, XI, and
XII; becaufe thefe are the moft delicate orders.
But, in the Tufcan and Doric fhafts, I have followed the
common method; becaufe thefe robuft columns will admit of
more apparent, or more fudden diminution than the other
three.
The moft common method is as follows. See Plate VIII.
Divide the fhaft into three equal parts, and draw a diameter
at the firft part. On this diameter defcribe a femicircle, and di-
vide the femidiameter into five equal parts. From the fourth
divifion raife a perpendicular line which determines the upper
diameter and cuts off a portion of the femicircle, which is to be
divided into four on the curve. Laftly, divide the upper two
thirds of the fhaft into four equal parts, anfwerable to the four
equal parts on the curve; and from each of thefe divifions, or
parts, on the curve, draw right lines to the correfponding divi-
fions on the fhaft, by which, four points will be found through
which the diminifhing curve line is to pafs, and, if accurately
drawn, will appear fmooth. Obferve, this diminution brings
the column, at its fuperior diameter, to forty-eight minutes;
S 2 but