, 1875-08-18

IA OkuOIOu lubO duUtuOL 0oN
same amount of cane slices $1,000 lbs.l contain
ing the same amount of sugar 200 lbs.) tnen
the surrounding fluid will take from the slices
twenty-five pounds of sugar, leaving seventy
five in the cane and having itself In solution
seventy-fve. In the third vessel, the half OF
twenty five will be taken, in the fourth the
halt Of twelve and a half, in the fifth the half
of six and a quarter, or in other words, in the
fifth vessel the thousand pounds of water would
contain one hundred pounds less three 1000 or
ninety-six 1000 pounds Of sugar. If you carry
the process one vessel farther you will lose
only the half of this three and odd per cent;
but however far you may carry it, you will
always be, if even an infnitesimal fraction,
behind the whole quantity of sugar contained
in the cane. IF for instance the juice in the
cane weighs SO Beaum6, diffusion will be able
to come within a fraction of this weight, but
never to the same density. Hence, the
greater amount of water to be evaporated for
the same amount of sugar. Practical working
has shown this to be from Is to 20 per cent.
We have thus followed the juice from the first
to the sixth vessel, let US now see what
becomes of the cane slices in these vessels.
Number one we left with a thousand pounds of
cane and fifty pounds of sugar in its cells. One
thousand pounds Of water brought into this
vessel will extract from it twenty-five pounds
of sugar, leaving the same amount in the cane
slices. These thousand pounds of water con-
tanning twenty-five pounds of sugar, go to vessel
number two, which, as will be remembered, con-
tains seventy. five pounds of sugar in the cells Of
its cane slices. From this vessel it will therefore
take twenty-five pounds of sugar, again leaving
in it fifty pounds of sugar and containing fifty
pounds itself. Carried into number three, it
will take the half of thirty-seven and q half,
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The thousand pounds of juice going into YES.
sci number four, which now contains sixty
eight and three quarters pounds of sugar, take
out of this vessel twelve and a half, leaving in
1t eighty-one and a quarter. In plumber five
the half Of the differenc between ninety-six
I'd and eighty-one and one quarter whichis seven
~, 80 pounds, added to its previous contents
gives eighty-nine pounds of sugar. This
is then carried into number six which contains
fresh cane slices with one hundred pounds Of
sugar. From number six the juice is again
thick juice and contains niEety-four and a half
pounds of sugar. In number seven, this is
brought to ninety-seven and a quarter pounds,
leaving only two pounds and three quarters to
be added to make it one hundred. We 90 now
again to vessel number one, which we left with
twenty FIVE pounds, and go ON through the anne
rotation. It is obvious that after having pas
sed one thousand pounds of water seven times
through number one, it must be entirely ex-
hausted Of its saocharine contents, and the
cane slices can be thrown out without material
loss. The vessel is then opened at the bot
tom and number two becomes number one.
After the next charee number two is exhaust
ed and discharged and number three becomes
number one, and so on. One vessel always
filed with fresh cane slices while another is
discharged. This process goes on continually,
seven vessels being always full, while three
are empty. There are ten vessels in a battery
in order to have always three for cleaning
purposes and in case something should hap
pen to one of them. Thus, this last season
a'whole run was made with nine vessels, on
account of one vessel having become derang-
cd. g
1t is necessary to be thus tediously explicit
in explaining the working of the prinoi-
pie of diffusion, because it forms the basis
Of this whole report. 1t will avoid referring
continually to the principle on which all the
calculations and deductions are made, while at
the same time it enables every one to judge
for himself as to the conclusions arrived at.
Lastly, In connection with the above, it must
bs'stated that the process as just described is
On ideal one, which is considerably modified
in practical working. One part only is always
certain,' that a vessel is never discharged un-
less 1t has had the fresh water passed through
10 seven times, which ensures nearly complete
exhaustion, so that the cane slices do not give
Ahnl r1inhfacf nvidonon IF onnfoioinr cooobor;no