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that retain the arms of the catapultæ. The height and
width of the holes in the capital are thus fashioned.
The plates (tabulæe) which are at the top and bottom of
the capital, and which are called parallels (paralleli) are
equal in thickness to one hole, in width to one and
three-quarters, and at their extremities to one hole and
a half. The side posts (parastatæe) right and left, exclu-
sive of the tenons four holes high and five thick, the
tenons three-quarters of a hole. From the hole to the
middle post also three-quarters of a hole, the width of
the middle post one hole and a quarter, its thickness one
hole. The space wherein the arrow is placed in the
middle of the post, the fourth part of a hole. The four
angle pieces which appear on the sides and front, are
strengthened with iron hoops fastened with copper or
iron nails. The length of the channel which is called
grolé in Greek, is nineteen holes. That of the slips
(regulæ) which lie on the right and left of the channel,
and which some persons call bucculæe, is also ninetéen
holes, their height and width half a hole. Two other
slips are fixed for attaching the windlass, three holes
long and half a hole wide. The thickness of a slip is
called camillum, or according to others the dove-tailed
box, and is of the dimension of one hole, its height half
a hole. The length of the windlass is eight holes and
an eighth. The roller nine holes wide. The length
of the epitoxis is three-quarters of a hole, and its thick-
ness one-quarter. The chelo or manucla is three holes
long, its length and thickness three-quarters of a hole.
The length of the bottom of the channel sixteen holes,
its width and thickness each three-quarters of a hole.
The small column (columella) with its base near the
ground eight holes, the breadth of the plinth in which
the small column is fixed three-quarters of a hole, its
thickness three-twelfths. The length of the small
column up to the tenon twelve holes ; three-quarters of
a hole wide, and five-sixths of a hole thick. The three
