14 ECONOMIC GEOLOGY. 
section. Fig. 4 is a transverse section of the same in the plane y y, Fig. 3. Fig. 5 
is a detached section of the washer in a larger scale than the first two figures. 
Fig. 6 is a plan or top view of the same. 
Similar letters indicate corresponding parts. 
This invention consists in the arrangement of a voltaic pile in the interior of 
‘ aSheets--Sheet!, 20 amalgamating-cylinder in 
JH. RAE. such a manner that, when 
Improvement in Voltaic Amalgamators for Gold and Silver said cylinder is charged with 
No. 123,932. Patented Fob. 20, 1872, : 
the pulverized ore, quicksil- 
Pug t 3 
4 ver, and proper chemicals, 
and then revolved, the gal- 
4 4 vanic current excited in the 
pile materially promotes the 
amalgamating process. Also, 
BU SEEPS in the arrangement of a rod 
= e, f extending centrally through 
; the amalgamating - cylinder, 
a and forming the support of 
q the voltaic pile, the copper 
elements of which connect 
with one head, and the zinc 
‘elements of which connect 
with the opposite head of 
said cylinder, in such a man- 
ner that the elements are 
securely retained and not lia- 
ble to get out of position by 
the revolution of the cylin- 
Wilrg gen, tentos. der; and at the same time 
Mind hito gor the voltaic pile offers the 
M1 Moe, least possible obstruction to 
the revolving motion of the cylinder. Further, in the arrangement of one or more 
voltaic cylinders in a receiving-tank which connects with an agitating-tub in such a 
manner that the pulp discharged from said voltaic cylinder or cylinders can be washed, 
and the floating particles of quicksilver contained therein can be saved. Also, in 
combining the voltaic cylinders, the receiving-tank, and the agitating-tub with one or 
more washers, composed of conical copper-lined vessels, each of which contains a hol- 
low inverted truncated cone suspended from a water-supply pipe, and provided with a 
large number of small holes in the bottom and lower part of its outer shell, in such 
a manner that, by the up current of the jets of water discharging from said holes, the 
particles of mercury still mixed with the tailings received in the washer are recovered, 
while the tailings flow off through a copper-lined gutter, the copper lining of which 
retains the last traces of mercury which may be still mixed with the tailings. 
