1they throw it
into a copper sieve, and separate the very small pieces which
pass through the sieve from the larger ones. of these the former are smelted
in a faggot pile and the latter in the furnace. Of such a number then are
the methods of washing.
pass through the sieve from the larger ones. of these the former are smelted
in a faggot pile and the latter in the furnace. Of such a number then are
the methods of washing.
A—TROUGH. B—LAUNDER. C—HOE. D—SIEVE.
One method of burning is principally employed, and two of roasting.
The black tin is burned by a hot fire in a furnace similar to an oven21; it
is burned if it is a dark-blue colour, or if pyrites and the stone from which
iron is made are mixed with it, for the dark blue colour if not burnt, consumes
the tin. If pyrites and the other stone are not volatilised into fumes in a
furnace of this kind, the tin which is made from the tin-stone is impure.
The tin-stone is thrown either into the back part of the furnace, or into one
side of it; but in the former case the wood is placed in front, in the latter
case alongside, in such a manner, however, that neither firebrands nor
coals may fall upon the tin-stone itself or touch it. The fuel is manipulated
by a poker made of wood. The tin-stone is now stirred with a rake with two
The black tin is burned by a hot fire in a furnace similar to an oven21; it
is burned if it is a dark-blue colour, or if pyrites and the stone from which
iron is made are mixed with it, for the dark blue colour if not burnt, consumes
the tin. If pyrites and the other stone are not volatilised into fumes in a
furnace of this kind, the tin which is made from the tin-stone is impure.
The tin-stone is thrown either into the back part of the furnace, or into one
side of it; but in the former case the wood is placed in front, in the latter
case alongside, in such a manner, however, that neither firebrands nor
coals may fall upon the tin-stone itself or touch it. The fuel is manipulated
by a poker made of wood. The tin-stone is now stirred with a rake with two
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