SCIENCE AND INDUSTRY. 
If the volume of liquor drawn off each day is equal to the “outer solution ” 
in the vat, then the volume of water used for the same period is equal to that 
volume required to cover the daily quota of dry bark. No attempt was made 
to control or influence the temperature of the first experiment with the press 
leach battery. The temperatures were recorded for the water as it went into 
the battery and the concentrated liquors as they were drawn off the bark. 
The first three experiments were carried out without stopping the battery, 
and, therefore, a certain volume of liquors containing tannin was carried from 
the first experiment to the second PT and from. the second to the 
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The base represents the number of days for which the several eeneriments were continued ; 
the vertical heights show the percentages of tannins extracted. 
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third. A correction has to be made for this. The first experiment (No. 1, see 
diagram on this page) was continued for twenty-six days. The head vat was 
then corked up so that no liquor could flow beyond. The liquors were then 
drawn off at this vat and tested before passing them on to the first lot of bark 
required for the second experiment. In this way there was a complete barrier 
between the two experiments, and the amount of tannin which passed from the 
first to the second experiment was added to the first experiment and taken off 
from the second experiment. The same method was used for separating the 
second from the third experiment. 
& 154 
