E&MJ; 150 YEARS
APRIL 2016 • E&MJ; 73 www.e-mj.com
mclanahan.com
for transmission around the mountain
to the Ontario and Daly mines, f ve and
a half miles distant, where it drives the
mills and lights the surrounding build-
ings. Current from these machines is also
taken to light the neighboring town of
Park City.
"The San Miguel Gold Mining Co. are
so well satisf ed with the result of operat-
ing in Southeast Colorado, near Telluride,
by long distance transmission, that they
decided to largely increase their plant for
themselves and neighbors, and the new
plant is now being installed. This addition
to the plant is supplied by the Westing-
house Co.
The Dodge Pulverizing Mill
"This mill, for pulverizing ore either for
amalgamation or concentration, has now
gone through suff cient test during the
past four years in California, Arizona
and elsewhere..." The Dodge pulverizing
mill consists of a hexagon drum or bar-
rel, as shown, into which the ore, after
passing through the rock breaker, is fed
through a hopper. The barrel is lined
with forged steel bars (each of the bars
seen to the left of the side view form one
side of the hexagon), which are held in
place by wedges, secured by bolts and
steel springs. These bars are spaced at
½-inch and from a grating through which
the ore passes to the screens, which are
on each side of the hexagon and afford
a ready means of discharge for any ore
that is crushed f ne enough to pass. With
the mill being hexagonal in shape, the ore
does not slide in mass, as is the case in
cylindrical mills.
The Cyclotomic Transit
The novelty of this new transit lies in a
f oating exterior ring placed around the
periphery of the lower plate, upon which
the f gures from 0 to 360 are engraved.
These f gures are then no longer a f xed
part of the circle, but possess that in-
dependent rotation. Instead of turning
the whole plate around its vertical axis,
we turn a narrow metal band around the
stationary plate, which is the same thing.
As this band appears to be sliced from
the plate, the name Cyclotome has been
applied to it, from the Greek words for
"ring" and to "to cut," that is a ring cut
or severed from a disk.
The Cyclotomic Transit.