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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