sidue-water of the first boiling, by repeatedly
passing over the cords, deposited all
its salt in about forty-five days, and the
cords were incrusted with a cylinder of pure
salt, which was broken off* by a particular
instrument for the purpose.* This process
is at present abandoned for crystallizing;
but the cords are still used for evaporating,
and are found to answer better for the
higher concentration of the water, than the
faggots. This method did not answer for
the first evaporation, because the water
rotted the cords; but it was discovered
that the cords were not soon injured by it,
when it had acquired five degrees of
strength. The cords, we were informed,
had many of them remained thirty years
in use, without being changed : indeed,
they were so thickly encased with depositions
of selenite, that they were defended
from the action of the water. This mode of
evaporating is found to be more expeditious
than that of the faggots.
A sketch of the evaporating house.
No. 1., is annexed; No. 2. is similar to it
in every respect.
This process might be used for sea-water with particular
advantage in warm climates, and the necessity
for boiling altogether avoided.
r-'
i d