Page To face Plate XVII.

To face plate XVII. Fig. A shews the diminishing of the shaft: divide the
diameter into 12 parts, each part is 5 minutes, which is the diminishing
of the shaft, as shewn by the dot lines 1.2, and when they touch the arch
at 1, divide that part of the arch 1.3 into 4 equal parts, and draw them
cross to 1.2.3.4, on the opposite side, then divide the height of the shaft
into 4 parts, and draw them cross the column to meet the dot 2.3.4, at which
points of meeting tack in nails, and bend a slip to mark it by, which gives
the profile or swelling of the column; to set out the flutes and fillets
on the column, take the girt at the bottom, and extend it from a to b on
fig. E, and likewise the girt at the neck, and extend it from c to d, and
mark the flutes and fillets, as from a to b, on a flip of the strong paper
or vellum, then fix it tight round the column, and mark them on the column;
run 96 parts on a right line, as e f, which must be less than the circumference
of the column: to set out the flutes and fillets on the pilaster, run 29
parts on the line 1.2, greater than the diameter, make the triangle 1.2.3,
draw the lines to 3, then the pilaster a b is divided for the flutes and
fillets; give 3 to a flute and 1 to a fillet; c shews the manner of fluting
and cabbling: the cable is one third of the shaft of the column.