The Salt Lake herald. [volume] (Salt Lake City [Utah]) 1870-1909, 1897-10-31

a mans fist and from the lower set of
rolls drops into an elevator or endless
conveyor, which carries the pieces up
to the top of another part of the build
ing, and dumps them into shaft lead
ing down to three more sets of rolls
set directly beneath one another. AS
the rock passes through these rolls the
latter are found to be placed nearer
and nearer together, until with the
last or third set. the two rolls com
posing it are set tightly against each
other, so that when the rock ultimately
passes trough, it has been reduced to
dust.
One of the remarkable features of this
immense crushing plant is that the
crushing done BY the largest or what
are known in Edison" as the giant
rolls. is not the direct result Of the
energy of the steam engine. The rock
is really crushed by momentum For
instance. the engine which operates the
106-ton rolls is of less than 100 horse
power 1t has Just power enough to
cause the big rolls to reVolVe at ter
rife speed. but more than this it can
not do. If any obstruction-a rock, Tor
inStance-should come between the rolls
a patent clutch by which the engine is
connected TO the rolls at once causes
the engine to let go its hold. The mo-
mentum of the rolls, however. carries
them around, ana the rock is crushed
by this stored-up energy. The same en-
ergy, il applied directly from the en-
giue, would necessarily have to be much
greater than it is, and at the same
time the shock of the obstruction COM
ing between the rolls would Jar the
engine to pieces in a short time. In
fact it may be said that the work of
ore separation would not be CONNER
cial success were it not for the utilI
zation Of three natural forces-monen-
tum, magnetism and gravity-momen-
tum to crush the rocks, gravity to take
the place Of expensive machinery in
separating ore, and magnetism to draw
the fine particles of ore from the sand.
a MILE OF MAGNET FACES.
One of the features of Edison"
is the great NUMBER OF endless
chain elevators which connect the
buildings with one another. AS the ore
passes through each building. it is car
ried on to The next automatically in
these endless elevators. After it leaves
the crushing plant. 1t Is carried to the
top of the magnet house and dumped
into space, to find its way through
many sieves OF varying meshes and
past many magnet faces of varying
strength before it ultimately falls in
the cellar of the building and into an
other elevator which carries the greatly
ohanGed product TO the next depart
meat. There is over mile OF magnet
faces in the magnet house. The ore
drops down through long chutes. On
The way down it passes the magnet
faces. Directly under each magnet face
is a side chute leading off in direc-
ton OF its own, and directly above
each magnet face is sieve. AS the ore
comes dow.1, if fine enough to pass
through the sieve. it continues its
course; if not, it rolls Off the sieve into
a chute at the bottom of which there is
a conYeyor which carries it back TO the
rolls to be recrushed If the product
goes through the sieve, the magnet
draws the ore from the sand. the sand
passing straight down to an elevator
which carries it out of the building and
dumps it into huge sand pile.
The falling sand presents very
beautiful sight. A stream of it, SHIN
mering and shining in The sunlight, de-
scends AID mixes with the great cone
already piled up beneath. Nothing could
be more beautiful than this gorgeous
cataract of powdered rock falling like
VEIL and noiselessly adding to the
great mass below Nor is it a useless
accumulation. 1t is sold for various
purposes to builders and manufacture
ers. who seek it more eagerly than
they do the sand of the Seashore or of
the bank Seashore or bank sand has,
| in the course of centuries, lost its edges,
| because the particles have constantly
rubbed against one another. Broken
rock sand, however, is very sharp, and
for cement and lime work is very de-
! sirable.
SIX HUNDRED EXPERIMENTS.
The pure ore is now allowed to drop
downward and pass through a room
: where blowers rid it of any dust
which may have accompanied it on
it's travel. After leaving the blower
room it is really a stream OF pure,
finely divided iron ore, which drops
into eonyeyors and is carried to a
store house. which holds 5000 tons.
Here it may rest temporarily, or it
! may pass ON by means of other con-
yeyers 10 the mixing house. It cannot
| be smtfted in the form of iron dust.
! The force of the blast would blow it
! from the furnaces. 1t must be made
| into briquettes, and I'll order to do this
| 1t must be mixed with some adhesive
substance which will prevent it from
disintegrating when brought under the
! action of the furnace The mixing