TANNINS FROM WATTLE BARK. 
each day is equal to the volume required to cover the wet bark in one vat, 
and if these results can be duplicated in the tanneries, the liquors would be 
stronger than any liquor required for the tanning of hides that pass through 
the splitting machine, or, indeed, for any skins. 
If a tanner were getting a 60° barkometer liquor off the battery and only 
using a 40° barkometer liquor for his strongest one in the tan-yard, then he 
Comenh Plasrered, e 
Earthenware pipe 
Cross Section 
A. Plug. B. Plug and Overflow. C. Overflow Pipe. Scale, }” = 1 ft. 
could reduce the strength of the liquor from the battery by taking off a greater 
volume of liquor per day, which would mean a similar increase in the volume 
of water placed in the battery per day. Now, any extraction process will be 
more efficient the greater the volume of water used per day when the daily 
quota of bark remains constant, so that it is not a good policy to take off 
liquors that are stronger than the best one required for any particular tannery. 
This applies to tanneries where the weaker liquors from the tan-yard are never 
pumped back on the bark, ‘ 
C79 
