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CO 
640 
vats that. centain the green goods ; for as 
the liquor | in thé courfe of ‘being worked 
from one ieak to another pacomcas fronger, 
fo it proportionably expends the bark in 
each leak ; and again, as the green goods 
in the courfe of pafiing threngh the vats 
numbered 24 become in a gieat degree 
tanned, they ferve materialiy to diminifh 
the ftrength of the oozes they are in, 
which of courfe, when the leaks are again 
worked, ferves greatly.to expend the bark 
in the leaks. ‘Thirdly, the leather ma- 
nufaétured by this procefs does not re- 
quire half the ufual time to manufacture 
it that is im general required 3 it is in 
weight fuperior to the beft tannage in this 
country, and in other the moft effential 
qualities tuperior to any other leather yet 
manufactured, as it is more elaitic, and 
poficfles more of the quality of extending 
during the procefs of currying, is ftronger, 
tougher, more durable, and le{s penetrable 
by water; as by means of the ooze patiing 
through the leaks, in the progrelfive and 
frequent manner it se the ooze is de- 
prived of an acid quality, which I find all 
cozes to become pofteffed of, and in the 
proportion as they become {pent by the 
‘goods, and which I have alio oblerved to 
increafe in proportion to the original 
firength of the ooze, being in weak li- 
quors Jefs than in ftrone, tay which I 
‘have difcovered to be the mat reafon tha 
all Jeather hitherto manufaCtured by ftrong 
cozes is/fo greatly defictent m ail the 
fix laft mentioned moft valuable and mok 
effential qualities. The objervation fo 
frequently made in refpe& to the quality 
of the leather of the prefent day, that it is 
not equal to what leather fcrmerly was, 
may be Stina for inthis way, that it 
is generally tanned in lefs time, and of 
courfe “in cee oozes; which, from 
their becoming “poffelled of the acid ina 
greater degree, caufes the leather to be 
le{s elattic, lefs capable of extention during 
the proce!s of currying, not fo ftrong, 
more brittle, lefs durable, and more rea- 
dily: to imbibe water. In refpect to the 
difpofition of the vats, it 1s not altogether 
neceflary that they. fhould be placed as, in 
the above plan, but in general I have 
found it to be the moft advantageous way 
ot difpofing them. More or lets in num- 
ber of each delesition may be uled ac- 
cording to circumitances 3; but if lefs, the - 
advantage of the RiGee will be in moft 
cafes only obtained in ae ; but the chick 
thing required is to difpofe the leaks and 
a certain number of vats, containing the 
green goods, in fuch 2 manner. that -they 
may be worked as theug 
Mr. Brewin’s Patent for Tanning. 
4 they were one 
f Sept. 
fet of leaks, and that the vats in which are 
the forward goods may be fo placed that 
they may conveniently be drawn through 
the beft leaks, fo often as may be required 
for the purpofe before obferved, the renew- 
ing of the ftrength of the ooze, and keep- 
ing it fo free from what I term the acid 
quality, as that it fhall not materially in- 
jure the leather. Should a better ooze 
be required than can be obtained by mak- 
ing one leak only, preceed to make another 
before you draw any of the vats; after 
which as many vats may be drawn through 
the two, as would have been drawn had 
one only been made before you drew the 
vats, the firft wooze will be particularly 
good, which however will caufe the laf 
not to be fo good as ufual, provided as 
many are drawn as would have been from 
the two; if ooze of lefs ftrength is re- 
quired for the forward goods, draw it 
from that Ieak that you conceive to be of 
the ftrength required ; or fhould the filling 
up of the whole leak at one time make a 
better ooze than is wanted, and the laf 
made leak fhall not be good enough, make 
anew leak, and put in fo much bark only 
as will make the ooze of the, ftrength you 
wifh it to be; it may afterwards be made 
up at one or more times, according to the 
quality of the ooze required. Much of 
the labour of pumping the wooze may be 
faved by connecting two or three or more 
of the leaks together, with a pipe laid 
about 12 inches from the top of the leak, 
in fuch a manner that the ooze may be 
made to pafs through the whole body of 
the leak, iby means of the eye being water 
tight, and of the pipe that forms the com- 
munication between the leaks being placed 
the one end in the body of one leak, and 
the other in the eye of the other leak; the 
vats muft alfo be conneéted in the fame 
manner, and wiil require an extra eye but 
of about 3 inches fquare only, and the pipe 
that ccnne&ts the vats fhould be withm 
2 or 3 inches of the top of the vats. In 
this cafe the oozes are in fome degree 
mixed in the courle of working the leaks 
and vats, which fhould be availed The 
pumping may be faved by placing the vats 
fuch an height one above another, as that 
they would run one into another by means 
of acock. In general - will be found 
molt advantageous to work the pumips and 
handling machine | oy a cheaper power than 
that of men, viz. by horfes, water, &c. 
Tt will often be found convenient in 
adapting an old vard to this precefs te con~ 
neé owe or three or more vats together 
by means of a pipe at the bottom of the 
yats, and work them as one Vat, as if wall 
fave 
