All
this time the water has been passed into the top of 1, and this is
continued until the juice has been drawn from 9. Valve c to cell 1 is
now closed, and compressed air is turned into the top of 1 to drive the
liquid forward into 10. After the water has thus been nearly all
expelled from 1, valve a of cell 2 is lowered so as to shut off
communication with the juice pipe, and b, of cell 2 is closed. a and
b of cell 1 have, it will be observed, been closed or down from the
beginning. Cell 1 is now isolated from all others. Its chips have been
exhausted of sugar, and are ready to be thrown out. The bottom of 1 is
opened, and the chips fall out into the car, o (see diagram, Fig. 1),
and are conveyed away. Immediately on closing valves a and b of cell
2, c is opened, and the water presses into the top of 2, as before
into the top of 1, and the circulation is precisely similar to that
already described, 2 having taken the place of 1, 3 of 2, and so on.
When 2 is emptied, 3 takes the first place in the series and so on. When
12 has been filled, it takes the l3th place. (The juice pipe returns
from the termination of the series, and connects with 1, making the
circuit complete.) The process is continuous, and the best and most
economical results are obtained if there is no intermission.
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