The daily mountaineer. (Dalles, Or.) 1861-1866, 1865-12-12
9ailp mountalnecr,
A NEW METHOD or PULVERIZING


sette gives the following description Of
some machinery for quartz mill with
d capacity to pulverize 25 tons daily.
The machinery is on the ground, and
the Boston Company are about to put
it ups ta 6ue
The machinery consists first of
crusher, weighing complete with shaft
and pulley one ton. With fifteen horse
power, making 1,023 revolutions per
minute. One of these machines will
crush gravel size fifteen tons of ordi>
nary quartz per hour-requirng one
man to attend the crusher and two to
handle the ore. 1t consists of circu.
lar table or disc of cast iron, three and
half feet across, with four blades or
angular blocks of hard metal on it's
upper surface near the edge. This
table, weighing several hundred pounds
is made to whirl with great velocity
in the bottom of a cast-iron tub, the
sides of which are pierced with holes
an inch in diameter. The rock is
thrown into the tub against the blades,
and is knocked and beat about until
it is small enough to escape through
the perforations in the side, when it
falls into wooden chamber ten feet
square, from which it is taken out by
shute, and fed into the next machine in
order-the pulverizer-which consists
of a drum or hollow cylinder of cast
iron about three and half feet in di-
ameter, eighteen inches wide, and
weighing about one ton, fixed in strong
timber work upon solid masonry. The
cylinder rests its side with " horizontal
shaft passing through its axis. This
shaft, driven by baud and pully,
carries inside the drum at speed of
1923 revolutions per minute, a wheel
OF iron exactly resembling the side
wheel OF river steamer, the paddles
being of chilled iron of peculiar con
struotion, and patented. This wheel
is in fact an air. wheel, and not acrush-
or or breaker, therefore the material
must be broken fine by the crusher
before being introduced to the pulvcr
izer'
The reduction is not done by rub.
-bing or grinding, but by blows given
by the paddie-wheel, by the attrition
of the PARTICLES one against another,
and by the action of the worthless of
air created within the cylinder by the
rapid motion of the paddles. rhe air
is admitted with the finely broken
quartz, through central hole inyone
head of the cylinder and delivered at
the other end through similar hole,
the fineness OF the pulverization being
graduated by the admission OF more or
less air; tho current may be made
strong enough to carry away the mas
sterial when no finer than ordinary corn
meal, or it may be 30 moderated that
ii passes out in so finea dust that with
out tho use of the spray>wheel in
the chamber to which it is introduced, :,
many hours would be required for il to
settle. Thus the whole mass may be
reduced to a tneness not attanable
even by any pan process, and with
this great advantage over any other
plan, the gold and silver contained in
the ore in metallic state is found on
examination under the microscope to
have beaten and rolled into spheroidal
pellets, like small shot, instead of be.
, ing rubbed into scales, as by the stamp
and pan process, therefore not liable
10 float away during the process OF
washing and amalgamation, which is
: the third and last stage in this Boston