1in order that, if there is in the cakes any alum
or vitriol or saltpetre capable
of injuring the metals, although it rarely does injure them, the water may
remove it and make the cakes soft. The solidified juices are nearly all
harmful to the metal, when cakes or ore of this kind are smelted. The cakes
which are to be roasted are placed on wood piled up in the form of a crate,
and this pile is fired22.
of injuring the metals, although it rarely does injure them, the water may
remove it and make the cakes soft. The solidified juices are nearly all
harmful to the metal, when cakes or ore of this kind are smelted. The cakes
which are to be roasted are placed on wood piled up in the form of a crate,
and this pile is fired22.
A—PITS. B—WOOD. C—CAKES. D—LAUNDER.
The cakes which are made of copper smelted from schist are first thrown
upon the ground and broken, and then placed in the furnace on bundles of
faggots, and these are lighted. These cakes are generally roasted seven
times and occasionally nine times. While this is being done, if they are
upon the ground and broken, and then placed in the furnace on bundles of
faggots, and these are lighted. These cakes are generally roasted seven
times and occasionally nine times. While this is being done, if they are