Agricola, Georgius, De re metallica, 1912/1950

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1board is made of elder-wood or willow, and is ten digits long, six wide, and one
and a half digits thick; the iron bar is three feet long, and the wooden
handle inserted into it is two and a half feet long.
While he purges the
alloy and pours it out with a ladle into the copper mould, the fragments of
copper from which he is to make the second cake are melting.
As soon as
this begins to run down he again throws in litharge, and when he has put on
more charcoal he adds the lead.
This operation he repeats until thirty
liquation cakes have been made, on which work he expends nine hours, or at
most ten; if more than thirty cakes must be made, then he is paid for
another shift when he has made an extra thirty.
At the same time that he pours the copper-lead alloy into the copper
mould, he also pours water slowly into the top of the mould.
Then, with a
cleft stick, he takes a hook and puts its straight stem into the molten cake.
The hook itself is a digit and a half thick; its straight stem is two palms
long and two digits wide and thick.
Afterward he pours more water over the
cakes.
When they are cold he places an iron ring in the hook of the chain
265[Figure 265]
A—FURNACE IN WHICH “SLAGS” ARE RE-SMELTED. B—FURNACE IN WHICH COPPER IS
ALLOYED WITH LEAD. C—DOOR. D—FORE-HEARTHS ON THE GROUND. E—COPPER
MOULDS. F—RABBLE. G—HOOK. H—CLEFT STICK. I—ARM OF THE CRANE.
K—THE HOOK OF ITS CHAIN.

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