The Salt Lake tribune. [volume] (Salt Lake City, Utah) 1890-current, 1906-12-17

| been run several months and have given
no trouble. These rolls are driven at
peripheral speed of 375 feet per minute.
| They are driven by n belt which drives
set of gears, which drive the rolls.
Another Novel Feature.
Another novel feature of the wall
mill is the haking screen, which con,
| sisfs of anv number of screens placed
| vertically one above another at slight
angle. in framework running IN
| guides. This frame is forced down by
rotating cam compressing two
springs. When the cam releases the
| tappet the springs send the framework
up quickly and it hits bumper Inc
upward bump has tendency to keep
the springs from binding. This screen
seems TO DO good work. for 1T does not
bind up. 1t is the invention of F. II.
Bemis and is patented. The Wall jig
is highly commended by all Utah mil
men who have investigated II. II is
one of the moving screen type OF 1gs.
II consists of three different screens
actuated by three different cams which
operate in three different hutches. or
course more compartments can be used
if desired. BY means of rotating
cam and lever the screen tray is lifted
up slowly and then dropped quickly,
giving weak suction and strong
pulsion to the material. The fine ma
tcrial discharges into hutch having
N-shaped bottom, while the coarse
stuff discharges automatically through
device at the end of each screen. The
bridge piece which regulates the depth
of screen bed is adjustable so that the
depth of bed can be maintained at any
thickness desired. AS this slot for draw
ing off the material is as wide as the
screen, n very even bed is obtained on
the screens Moreover, rs this is self
maintaining, but very little attention
is required In order to keep even con
ditions in the hutch. the hutch product
is discharged with considerable water
In case water is scarce, this water can
be returned and used over again. The
screen discharges into a trough placed
in the hutch box and is carried TO
spout which discharges on the outside
so that the product from the screen can
be seen and the depth of bed regulated.
In the latest type of this Jig, Colonel
Wall has adopted the cam and tappet
motion used on his table instead of the
cam and lever motion, The tappet al
lows an easier adjustment of the stroke
than the lever, but in either case the
length of stroke can be regulated while
the Jig is running, and there is no dan
ger of its changing, as is generally the
case in the ordinary eccentric motion
OF the Harz jiC As has been previous
does Jog unsized stuff and makes good
saving of mineral. He claims as the
good points in his jig, the following;
(D The fact that the moving screen
requires less repair than the mainte-
nance of the plunger in the Harz Jig;
(2) the ability to adjust the throw
while in motion and the permanence of
this adjustment; (3) the uniform depth
of bed obtained by his discharging de-
vice; (4) the even effect of tho current
over the entire screen area, which can
not be obtained with Harz Jig; (5)
the fact that each of his compartments
is independent and has the ability TO
discharge itself, feature the Hancock
Jig does not possess; COZ the ability to
Jig unsized material.
The Wall Table.
The Wall table consists OF table
surface placed on a truss work which
rests upon four supporting hinges
placed upon two beams. Fastened to
these beams arc two uprights which
carry the cam shaft and also serve as
the bumper. The Wall table is simply
an improved Gilpin county bumper, but
instead of humping IN compression, like
its prototype. the humping is done In
tension, so that there is no tendency
10 buckle the surface of the table. The
humping mechanism of the Wall table
consists of n rod threaded at each end.
On the table side of this rod. resting
against the box in which the rod moves,
is a spiral spring. put into tension by
nut Mounted on the upright is cam
engaging tappet which is held up
against a nut by spiral spring abut.
ting against humping collar welded
upon the rod The rotating cam en-
cages the Taper, moves over the table
toward the left and congresses the
spring The tappet is released and the
table is sent back by the spring until
the bumper strikes the box in which
the rod moves, giving the table bump.
The violence of this bump is deter
mined by the amount Of original com
preston in the spring and also upon
the length of stroke given the table.
The length of stroke can he regulated
by moving a nut. The compression on
the spring is also regulated by moving
nut, Either of these adjustments
eau be made easily while the table is
in operation.
The surface of the table is feet
long by feet wide and is rectangular
in shape. The feed end consists of
series of rifles, parallel with the length
OF the table. a space of . feet 4 inches
at the discharge end is surfaced with
corrugated rubber, of which the cor
rugations also run parallel with the
length Of the table. The rifles are a
inch wide and y inch apart. The cor
rugations in the rubber are about l.
inch deep. The ore is stratiied in these
troughs by the bump. and is also sent
by it's inertia toward the discharge end.
1t gradually forced to climb higher
and higher, allowing the lighter upper
strata to wash of from the underlying
strata until finally it reaches the cor
rugated-rubber surface. The ore ira
wells this surface and the remaining
gangue is washed out by the feed wa.
ter, each corrugatio filing with con
centrate. The overlying concentrate
washes down the slope until finally all
the corrugations down a certain dis.
tance are filled with heavy conecn.
trates Then they begin 10 fiji with
lighter concentrate or middling and so
on. The concentrates are conveyed
across this corrugated surface TO the
discharge end, while the tails wash
down the slope.
Stroke Of Table.
The table can be run at any speed
| from one stroke per minute up 10 such
speed that there is only n momentary
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