IMPROVEMENTS IN ÅDDARATUS FOR SEPARATING ORES AND OTHER MATERIALS."
Year: 1871

page_text: LETTERS PATENT to George Green, of Aberystwith, in the County
of Cardigan, Engineer, for the Invention of "IMPROVEMENTS IN
ÅDDARATUS FOR SEPARATING ORES AND OTHER MATERIALS."
PROVISIONAL SPECIFICATION left by the said George Green at the
Office of the Commissioners of Patents, with his Petition, on the
28th October 1871.
I, GEORGE GREEN, of Aberystwith, in the County of Cardigan, En-
gineer, do hereby declare the nature of the said Invention for "IMPROVE-
MENTS IN APPARATUS FOR SEPARATING ORES AND OTHER MATERIALS," to be as
follows, that is to say:
-
This Invention has for its objects to improve the action of apparatus
used for separating ores and other materials, and, as regards a portion of
the improvements, to simplify the construction and reduce the space
occupied.
A first portion of the improvements relates to what may be termed
an improved mineral dolly tub for washing slimes. This dolly tub is a

page_text: circular vessel with a raised centre, and in one modification is provided
with the usual paddle or paddles revolving upon a pendent vertical
shaft. The part of the bottom between the centre and sides is by pre-
ference sloped downwards from the centre.
The apparatus is intended to be used in combination with “classifiers"
such as are described in the Specification of Letters Patent granted to
the present applicant and dated 20 April 1869 (No. 1212), each
" class "
of materials being fed to a different dolly tub or at a different
time to the same tub. The materials along with a regulated supply of
water are led by a launder so as to fall into the dolly tub by preference
near the side, and the whirling motion produced by the paddles and the
consequent centrifugal tendency cause the heavier minerals to move to
the side, and they gradually descend to the deepest part of the bottom
from a point in which they are withdrawn by a regulated aperture. A
funnel is formed in the top of the raised centre and leads to a central
discharge pipe by which the water and the light slime or waste passes off.
In some cases the revolving paddle or paddles may be dispensed with and
the desired action obtained by directing the inflowing water tangentially
or otherwise so as to produce a suitable motion, and the action may be
controlled by regulating the ingress of water whilst the egress is of
course adjusted to maintain a suitable depth of water in the vessel.
The second portion of the Invention relates to that part of a con-
nected series of mineral dressing or ore separating apparatus known as
jiggers, in which as hitherto constructed water acted upon by a piston
or plunger in one compartment is thereby made to reciprocate in another
compartment up and down through stationary sieves on which the ores
or materials to be acted upon are placed.
By the present Invention the compartment with the separate piston
is dispensed with, and the sieves instead of being stationary are by re-
volving cranks or eccentrics made to reciprocate up and down through a
the water. With this improved arrangement an equal if not better
action will be obtained as compared with existing jiggers by means of
apparatus occupying less than half the space and costing considerably less.
Two or more 'sieves may be fixed in one reciprocating frame, the space
beneath being partitioned into compartments to receive separately what 3
passes through the respective sieves.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said George Green in the Great Seal Patent Office
on the 26th April 1872.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, GEORGE
GREEN, of Aberystwith, in the County of Cardigan, Engineer, send
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twenty-eighth day of October, in the
year of our Lord One thousand eight hundred and seventy-one, in the
thirty-fifth year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto me, the said George Green, Her special licence
that I, the said George Green, my executors, administrators, and assigns,
or such others as I, the said George Green, my executors, adminis-
trators, and assigns, should at any time agree with, and. no others,
from time to time and at all times thereafter during the term therein
expressed, should and lawfully might make, use, exercise, and vend
within the United Kingdom of Great Britain and Ireland, the Channel
Islands, and Isle of Man, an Invention for "IMPROVEMENTS IN APPARATUS
FOR SEPARATING ORES AND OTHER MATERIALS," upon the condition (amongst
others) that I, the said George Green, my executors or administrators,
by an instrument in writing under my, or their, or one of their hands
and seals, should particularly describe and ascertain the nature of my
said Invention, and in what manner the same was to be performed, and
cause the same to be filed in the Great Seal Patent Office within six
calendar months next and immediately after the date of the said Letters
Patent.
..
NOW KNOW YE, that I, the said George Green, do hereby declare
the nature of my said Invention, and in what manner the same is
to be performed, to be particularly described and ascertained in and by
the following statement in writing, reference being had to the accom-
panying Drawings, that is to say:-
My said Invention has for its objects to improve the action of apparatus
used for separating ores and other materials, and, as regards a portion
of the improvements, to simplify the construction and reduce the space.
occupied.
And in order that my said Invention, and the manner of performing
the same, may be properly understood, I hereunto append two Sheets of

page_text: explanatory Drawings, to be herein-after referred to, and representing
apparatus as made with my improvements.
A first portion of my Invention relates to what may be termed an
improved mineral dolly tub for washing slimes, and which is represented
on Sheet 1 of the Drawings. Figure 1 being a plan, and Figure 2 at
vertical section. This dolly tub is a cylindrical vessel 1, which may be
conveniently made of cast iron, and which is formed with a raised
centre 2.
In one modification the dolly tub is provided with the usual paddles 3
carried by pendent arms 4, fast on the bottom end of a vertical shaft 5
held in bearings in a framing 6 fixed across the top of the tub. The
vertical shaft 5 is geared by a pair of toothed bevil wheels 7 to a hori
zontal shaft 8, also carried by the framing 6, and which has on it fast
and loose pulleys 9 to receive a driving strap. The part 10 of the
bottom of the tub between the centre 2 and the sides 1 is by preference 1
sloped downwards from the centre or made conical, as shewn. A funnel
11 is fitted to the top of the raised centre 2, and leads to a central
discharge pipe 12, by which the water and the light slime or waste is
discharged.
The apparatus is intended to be used in combination with “classifiers,"
such as are described in the Specification of Letters Patent granted to
me, and dated 20 April 1869 (No. 1212), each "class" of materials
being fed to a different dolly tub or at a different time to the same tub.
The materials along with a regulated supply of water are led by a
launder so as to fall into the dolly tub, by preference near the side,
and the whirling motion produced by the revolving paddles 3 and the
consequent centrifugal tendency cause the heavier minerals to move to
the side, and they gradually descend to the deepest part of the bottom,
from a point in which they are withdrawn by an aperture 13 of a regulated
size.
In some cases the revolving paddles 3 may be dispensed with, and
the desired action be obtained by directing the inflowing water tangen-
tially, or otherwise, so as to produce a suitable motion; and the action
may be controlled by regulating the ingress of water, whilst the egress
is of course adjusted to maintain a suitable depth of water in the vessel.
The whole of the water may be supplied along with the slimes, or a
portion of it may be introduced by one or more separate pipes. The
discharge of the water being by the central funnel 11, there is a con-

page_text: The
tinuous movement throughout the water towards that point.
circular motion, however, produces an opposite or centrifugal tendency,
which, acting principally on the heavier particles, carries them to the
sides of the vessel, whilst the lighter particles, being more under the
influence of the inward current, are by it carried to the discharge pipe
12. The supply and discharge to and from the apparatus may be either
continuous or intermittent.
The second portion of my Invention relates to that part of a connected
series of mineral dressing or ore separating apparatus known as jiggers, in
which, as hitherto constructed, water acted upon by a piston or plunger
in one compartment is thereby made to reciprocate in another com-
partment up and down through stationary sieves, on which the ores or
materials to be acted upon are placed.
By my present Invention the compartment with the separate piston
is dispensed with, and the sieves, instead of being stationary, are by
revolving cranks or eccentrics made to reciprocate up and down through
the water. With this improved arrangement an equal if not better
action will be obtained, as compared with existing jiggers, by means of
apparatus occupying less than half the space, and costing considerably
less. Two or more sieves may be fixed in one reciprocating frame,
the space beneath being partitioned into compartments to receive
separately what passes through the respective sieves.
Figure 3, on Sheet 2 of the Drawings, is a plan, and Figures 4 and 5
are vertical sections as at right angles to each other of my improved
jigging apparatus as fitted with three sieves 21, 22, 23. These sieves
are fixed in a rectangular frame 24, fitted to work up and down in a
fixed rectangular frame 25, forming the upper part of a tank or hutch,
which is supplied with clean water by a pipe 26. The bottom of the
tank is formed by three inverted pyramidal cast-iron shells 27, 28, 29,
forming separate compartments respectively under the sieves 21, 22, 23,
and the whole is supported by cast-iron standards 30. These standards
30 are fitted with bearings 31 for a horizontal shaft 32 running along
above the middle of the tank, and driven by a belt acting on a pulley 33.
The shaft 32 is formed with three cranks 34 of a small throw, to which
are adapted brasses working in transverse slots formed in the heads of
three connecting rods 35 fixed to the cross bars 36 of the sieve frame
24. The sieves 21, 22, 23, are fixed in the frame at successively lower
levels, and there are transverse division pieces 37, 38, between the sieves,

page_text: with their upper edges cut down to the proper overflow level for each
sieve. The stuff' to be acted upon accompanied by water is fed by a
launder 39 upon the highest sieve 21, and what is not separated by
this sieve overflows to the middle one 22, and some also overflows from
the middle one to the third 23. The waste finally overflows by a
discharge duct 40 at the end of the third sieve. The materials which
pass through the sieves may be discharged from the compartments 27,
28, 29, below at intervals by opening valves or sluices. I, however,
prefer to form small suitably proportioned apertures 41 at the bottoms
of the compartments, through which there may be continuous discharges
into receptacles 42, 43, 44, below, these receptacles being formed with
overflow ducts 45 for the water to pass off by.
Having thus particularly described my said Invention, and the manner
of performing the same, I have to state that I do not restrict myself
to the precise details herein described or delineated; but that what I
believe to be novel and original, and claim as the Invention secured to
me by the herein-before in part recited Letters Patent is,-
1. The constructing of a dolly tub for separating ores and other
materials with a raised centre or central waste overflow acting con-
tinuously, and with or without a continuous discharge for the cleaned
ore or materials, substantially as herein-before described.
2. The constructing of jigging apparatus for separating orcs and
other materials with reciprocating sieves, substantially as herein-before
described.
In witness. whereof, I, the said George Green, have hercunto set my
hand and seal, this Tenth day of April, in the year of our Lord
One thousand eight hundred and seventy-two