1let down from the
pulley of the crane arm; the inside diameter of this ring
is six digits, and it is about a digit and a half thick; the ring is then engaged
in the hook whose straight stem is in the cake, and thus the cake is raised from
the mould and put into its place.
is six digits, and it is about a digit and a half thick; the ring is then engaged
in the hook whose straight stem is in the cake, and thus the cake is raised from
the mould and put into its place.
The copper and lead, when thus melted, yield a small amount of
“slag”12
and much litharge. The litharge does not cohere, but falls to pieces like the
residues from malt from which beer is made. Pompholyx adheres to the walls
in white ashes, and to the sides of the furnace adheres spodos.
and much litharge. The litharge does not cohere, but falls to pieces like the
residues from malt from which beer is made. Pompholyx adheres to the walls
in white ashes, and to the sides of the furnace adheres spodos.
In this practical manner lead is alloyed with copper in which there is but
a moderate portion of silver. If, however, there is much silver in it, as, for
instance, two líbrae, or two líbrae and a bes, to the centumpondium,—which
weighs one hundred and thirty-three and a third líbrae, or one hundred and
forty-six librae and a bes,13—then the foreman of the works adds to a centum
pondíum of such copper three centumpondía of lead, in each centumpondium
of which there is a third of a líbra of silver, or a third of a libra and a semí
uncía. In this manner three liquation cakes are made, which contain
altogether three centumpondía of copper and nine centumpondía of lead.14 The
lead, when it has been liquated from the copper, weighs seven centumpondia;
and in each centumpondíum—if the centumpondium of copper contain two
líbrae of silver, and the lead contain a third of a líbra—there will be a líbra
and a sixth and more than a semí-uncía of silver; while in the exhausted
liquation cakes, and in the liquation thorns, there remains a third of a líbra.
a moderate portion of silver. If, however, there is much silver in it, as, for
instance, two líbrae, or two líbrae and a bes, to the centumpondium,—which
weighs one hundred and thirty-three and a third líbrae, or one hundred and
forty-six librae and a bes,13—then the foreman of the works adds to a centum
pondíum of such copper three centumpondía of lead, in each centumpondium
of which there is a third of a líbra of silver, or a third of a libra and a semí
uncía. In this manner three liquation cakes are made, which contain
altogether three centumpondía of copper and nine centumpondía of lead.14 The
lead, when it has been liquated from the copper, weighs seven centumpondia;
and in each centumpondíum—if the centumpondium of copper contain two
líbrae of silver, and the lead contain a third of a líbra—there will be a líbra
and a sixth and more than a semí-uncía of silver; while in the exhausted
liquation cakes, and in the liquation thorns, there remains a third of a líbra.