To draw this juice from 6, valve
a of 7 is raised to connect the heater between 6 and 7 with the juice
pipe. A gate valve in the juice pipe is opened into the measuring tank,
and the pressure of water into the top of 1 drives the liquid forward
through the bottom of 1, through the heater, into the top of 2, out from
the bottom of 2, through the heater into the top of 3, out from the
bottom of 3, through the heater into the top of 4, out from the bottom
of 4, through the heater, into the top of 5, out from the bottom of 5,
through the heater, into the top of 6, and now out from the bottom of 6,
through the heater, into the juice pipe, and from the juice pipe into
the measuring tank. It will be understood that the liquid which is drawn
from 6 is chiefly that which was passed into 1 when it was filled with
chips. There is doubtless a little mixing as the pressure drives the
liquid forward. But the lighter liquid is always pressed in at the top
of the cells, so that the mixing is the least possible. The amount of
liquid, now called juice, which is drawn from 6 is 1,110 liters, or 291
gallons. When this quantity has been drawn into the measuring tank, the
gate valve is closed, and the valves connecting with 7 are manipulated
as were those of 6, a measure of juice being drawn in the same way.
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