New-York tribune. [volume] (New York [N.Y.]) 1866-1924, 1890-09-30
Of fine dust. positive and contending forces must

Of fine dust, positive and contending forces must
necessarily be brought into active, play.
The importance and special efficiency OK tho means
provided for suppreSsins the movement and discharge
along with the q the liner particle Of sans1e and
OF sa t1 p,rss i graded to the
iron u each porlS and IT. %as nn t sassepiSy
Of these means that the ability depends TO perform
the critical operation Of eonysns non into
sulphur and tltanlnm bearing compounds
in the concentration Of ore. sy TIE ,. airy PTOcs roe.
msn Of Of large quantities Of o,eis generally dhlcuk:
When the reaches this machine the finer portions
and separated the roar,er. the concentrates. how.
ever finely pulverizcd being delivered from the machine
magnetic dust and the dmst carried away BY the air
current being also a, wholly free from any magneuc
material.
THE ATRANGEMENT OF THE POLES
The peculiar action OF tho ore in passing through
the complex multipolar magnetic field has already
been described. Upon the mode Of arrangement OF
the poles the efficiency Of the apparatus largely do
ponds. In this machine the magnetism OF the field
of attraction performs twO-fold function viz to
attract the magnctzabe matter Of the ore and as 1t
moved through the machine by friction upon the 70
vOlving drum. to turn it and over 80 as to allow
the gangie TO fall away, and also 10 permit the air
current 70 take effect all sides Of every particle oS
orc.
II the importance Of this operation Is once recoS
nizod. it will be readily understood that there can 10
only possible eccnt OF the pSlss
they conform to this other plan.
The positive character Of the functions above emu.
s"paraton nndcr tie c"nditons Of very heavy supply
Of TO the Machine. The easy workngCaparity
sd a "n ehs s% Sm S s a % pet
hour Of grannla"d 70 pass 10 to 20 mesh screens
The 1s" eSs a1 n and 10 :, 81 S,s
power TO drive the machine.
Those machines have been applied to the trtatmcnt
n sldPrabe
The most remarkable Of these was the conversion Of
N tif 7o oS M ore n Into 0 T. made
from the crude ore carrying Re 34.7. .so 2:3. thf
Bc,semcr concentrate representing about 80 per cent
An earlier type Of this machine in use during
ma magnetic mined 'ne which in the sTe or
prrdH duet found niarie' at ii;,,burs. Penn.
The works AT this mine are provided with
ssS s ra % tons Of S q 1S s to ans Stss
| Of ore is to be effected at the outset with three
separator, having working face on the drums Ut
In the mind: Of some persons who haze been s'udy.
poy"s the apparatus a hitherto avaiisls inaSiy to
convert some Of the welkno orcs nigh in phosphorus
.res ha; led to the Inference that some yet IN.
their successful treatment. The entirely successful
and economical malsccment Of these ores with this
SrSssS s' !s
ore th.t had ben properly prcpar"d The prepaSs.
It's physical and chemical characteristics Its final
separation would depend upon the efficiency n tbs
separator. which would constitute the last and snp
porting link In the chain Of operations. II is believed
that this machine Offers practical solution Of tho
| problem OF concentrating magnetic ore such as has
| not been hitherto provided.
| At the evening session Professor w. Il. Potter,
| OF 81. Louis, gave an interesting description Of
the Iron Mountain Mine. aided by numerous magic
| lantern views In the same manner w. F. Durfee,
of Birdsboro, Penn gave the beholders m In
sight into practice with diamond drill.