It is of sturdy proportions, its height
being about five and one half times the lower diameter of the
shaft. If the shaft tapered upward at a uniform rate, it would
have the form of a truncated cone. Instead of that, the shaft has
an ENTASIS or swelling. Imagine a vertical section to be made
through the middle of the column. If, then, the diminution of the
shaft were uniform, the sides of this section would be straight
lines. In reality, however, they are slightly curved lines, convex
outward. This addition to the form of a truncated cone is the
entasis. It is greatest at about one third or one half the height
of the shaft, and there amounts, in cases that have been measured,
to from 1/80 to 1/140 of the lower diameter of the
shaft.[Footnote: Observe that the entasis is so slight that the
lowest diameter of the shaft is always the greatest diameter. The
illustration is unfortunately not quite correct, since it gives
the shaft a uniform diameter for about one third of its height.]
In some early Doric temples, as the one at Assos in Asia Minor,
there is no entasis.
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