Year: 1889

page_text: Date of Application, 24th June, 1889-Accepted, 24th May, 1890

page_text: reduced by natural or artificial means to the necessary degree of fineness; a portion
of this material is placed in the hopper (h), the valve or door (¹) having been
previously closed and the catch (2) made fast; the bucket or hopper (g¹) being in
an upright position the water is turned on through the pipe (9) and commences to
fill the said bucket which thus becoming heavy, falls downwards overcoming the
upward pressure of the spring (1); when the said bucket (g) is filled or nearly
filed, it being so shaped that the front facing the hopper (h) is the heavier, it falls
over into the position shewn in Fig. 3 discharging its contents into the hopper (4)
and at the same time setting free the catch (2) and opening the bottom of the said
hopper so that both the material and the water are discharged into the gyrating
pan (b).
This pan being in constant motion by means of the crank (c³) every particle which
enters the pan is kept in motion according to the velocity and the throw to which
the cranks are set. This motion completely separates the material according to its
specific gravity and the motion being slightly centrifugal combined with the curved
or inclined surface of the pan, the larger matter is deposited in the center and the
gold or weighty substance is found to settle somewhere about midway between the
center and circumference of the pan (b).
The plate () is simply a sieve, which servos to separate the larger sand and gravel
from the finer material below. In the passage of the bucket g downwards the
pin (g) descends carrying with it the rod (D) which pressing on the lever (D³) the
valve (D) is raised in every dip and recovery of the said bucket and if the pan (6)
he sufficiently full the material to be saved having sunk below the valve (DI) each
time the bucket (g) descends a portion of the wash dirt in the pan (b) is precipitated
as tailings down the pipe (D) into the hopper (a').
When the material to be saved is sufficiently concentrated in the pan (b) it is
drawn off through the valve (k) as required.
The opening and closing of the valve (D') may be regulated by set nut (d³).
It will be seen that the pan (b) is continually in motion in a gyratory manner,
that by means of the water supply the wash dirt is drawn off automatically at intervals
measured by the amount of water supply to which the machine is set and further.
regulated by the set screw (9) and at similar intervals a supply of water and fresh
material is also automatically supplied.
I have found from experience that with some material such as fine gold a portion
may float on the water for a considerable time, and also some may become located
for a time in the center under certain circumstances; I have therefore provided a
conduit with an entrance (e¹) near to the periphery of the pan (6) and having
an exit (e) near the center of the said pan, and by this means a current is formed
by the action of the machine itself, the centrifugal force delivering the water and
any floating gold into the said conduit and by the assistance of gravity it is delivered
at or near the center of the pan (b) at (e) in the direction of the arrows; the
current causing it to again leave and clear the center of the machine, by these means
the possibility of any escape is rendered next to impossible.
After the gold or other material to be concentrated is drawn off, it is, of course,
mixed with a small amount of wash dirt from which it can be easily separated by
amalgamation or any other convenient method, or it can be amalgamated in the
pan (b) in which case the said pan must be specially prepared for the purpose.
.. Having now described and particularly ascertained the nature of my invention
and how the same is or may be carried into effect, I wish it to be understood that I
do not confine myself to the exact details, for it is possible to produce the gyratory
motion to the pan by eccentrics or other mechanical equivalents of cranks; also the
feed and circulation might be varied without departing from the principle of my
invention but what I claim as novel and useful and desire to secure by Letters
Patent is ;-
..
First. The separation of gold and some other minerals and materials by a pan (b)
having curved or inclined sides and a gyratory motion produced by cranks (c²) or

page_text: mechanical equivalents of the same substantially as described herein and illustrated
in the accompanying drawings.
Second. The combination of the pan (b) with the circulating pipe (e) substantially
as described herein and illustrated in the accompanying drawings.
Third. The combination of the pan (b) having a gyratory motion with the hopper (h)
and valve or lid (¹) substantially as described herein and illustrated in the
accompanying drawings.
Fourth. The combination of the pan (b) having a gyratory motion with the
hopper (h), having a valve or lid (4) with the bucket (9) oscillating on the bar or
pin (g), substantially as described herein and illustrated in the accompanying
drawings.
Fifth. The combination of the gyrating pan (b) with the bucket (g) and its cross-
bar (g) working in slots in the side frames (i. i.) with the with the connecting
rod (D) lever (D2) and valve (D') with its pipe and seat (D) substantially as
described herein and illustrated in the accompanying drawings.
Sixth. In a machine for washing and separating gold and some other metals and
substances the self acting hopper feed motion substantially as described herein and
illustrated in the accompanying drawings.
Seventh. The machine for washing and separating gold and some other metals
and materials substantially as described herein and illustrated in the accompanying
drawings.
3.
1
ROBERT EDWARD EVENDEN.
Hughes, Son & Co.,
38, Chancery Lane, W.C., Agents for the Applicant.