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Book IX: Smelting Ore

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BOOK IX.
one and a half palms thick. There are mortised into this longitudinal beam
the lower ends of upper posts three palms wide and two thick, which are six
feet two palms high, exclusive of their tenons. The upper ends of these
posts are mortised into an upper longitudinal beam, which hes close under
the rafters of the building ; this upper longitudinal beam is two palms
wide and one thick. The upper posts have a slot cut out upward from a
point two feet from the bottom, and the slot is two feet high and six digits
wide. Through these upper posts a round hole is bored from one side to
the other at a point three feet one palm from the bottom, and a small iron axle
penetrates through the hole and is fastened there. Around this small iron
axle turns the second lever when it is depressed and raised. This lever is
eight feet long, and its other end is three digits wider than the rest of the
lever ; at this widest point is a hole two digits wide and three high, in which
is fixed an iron ring, to which is tied the rope I have mentioned ; it is five
palms long, its upper loop is two palms and as many digits wide, and the
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