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curvature. Its thickness must be nine sixteenths of a hole.
The stocks are made equal to two holes and a quarter, the
width to one hole and three quarters, the thickness, ex¬
clusive of that part which is inserted into the hole, one
hole and a half; the width at the extremity, one hole and
a sixteenth; the length of the side posts, five holes and
nine sixteenths ; the curvature one half of a hole, the
thickness four ninths ; in the middle the breadth is in¬
creased as it was near the hole above described; its
breadth and thickness are each five holes; its height one
quarter of a hole. The length of the slip on the table is
eight holes, and it is to be half a hole wide and thick. The
length of the tenon two holes and a sixth, and its thick-
ness one hole : the curvature of the slip is to be one six¬
teenth and five quarters of a sixteenth ; the breadth and
thickness of the exterior slip the same; its length will be
found by the turning, and the width of the side post and
its curvature one sixteenth: the upper are equal to the
lower slips, that is one sixteenth: the transverse pieces of
the table two thirds and one sixteenth of a hole : the
length of shaft of the small ladder (climacis) thirteen
holes, its thickness three sixteenths: the breadth of the
middle interval is a quarter of a hole, its thickness five
thirty-seconds of a hole : the length of the upper part of
the climacis near the arms, where it is joined to the table,
is to be divided into five parts; of these, two are given
to that part which the Greeks call znôs (the chest), the
width one sixteenth, the thickness one quarter, the
length three holes and an eighth, the projecting part of
the chest half a hole. The pteregoma (or wing), one
twelfth of a hole and one sicilicus. The large axis, which
is called the cross front, is three holes; the width of the