The evening times. [volume] (Grand Forks, N.D.) 1906-1914, 1906-04-28
VAST STACK OF CONCRETE
Chimney in Butte the Largest and
Tallest Of the Kind.

The Butte(Mont.) Reduction works
has what is believed to be the largest
and highest concrete chimney in the
world. The inside diameter. both top
and bottom. Is Is feet and the height
Of the chimney Is 1893 feet 4 inches, or
252 feet inches above the surface: the
top of the chimney has also the rather
! uncommon altitude of 5.7913 feet
above the sea level.
The foundation of the chimney goes
feet below the surface, the lower
portion being formed of Stag poured
into gray-iron casting 100 feet
square, giving an area of 10000 square
feet. This process was repeated six
times, giving foundation IS feet deep,
tapering to &C 23 feet square at the
top and full of various forms of metal
sown through the Stag. AS feet of
this are in the ground there is neces-
sarily height of II feet above the
ground.
The base. which rests upon the Stag
foundation. is of Portland cement con-
crete. 421a feet square and 81 feet
high in the center. the concrete also
having metal distributed through it.
some of which projects up above the
base to help retain the walls of the
u
roots of tree.
THE chimney proper was formed in
system of sectional moIds 3h feet
high, which, when coupled together.
formed complete ring The concrete
walls contain vertical and horizontal
steel bars, the number reducing as the
height increases, and also rings of !
inch T-iron wired to the bars For the
first q feet in height of the chimney
the walls are IS inches thick and in
these walls are the two inlets to the
/ chimney, one on each side. each open
ing s by II feet.
On top of the 1S-inch wall straits the
double shell Of the chimney, the outer
shell being 9 inches thick, the inner
| shell inches thick, these shells be-
ing separated by 4-inch air space,
which at the bottom is connected to-
the atmosphere through the outer shell
by portfolios.
The inside shell extends up to
height of 1912 feet above thebase and
the outer shell is Offset over the inner
Shell. as can be seen on the exterior
OF the chimney, the air space being
left entirely open on the inner side of
the chimney and the inner shell per-
fectly free from the outer shell at the
top. The outer shell is then carried
seven inches thick to the top of the
chimney. The outer side diameter of
the chimney at the bottom is 81 feet
and the diameter of upper shell is 10
! feet 2 inches.
The weight of the chimney is as
follows: Stag foundation. 1880 tons;
concrete base. 1000 tons: chimney pro-
per. 1.475 tons. This chimney, be-
sides being the largest and highest
concrete chimney in the world, is one
of the largest chimneys of its height
in the United States. as can be seen by
the following examples of some large
chimneys Ia this country:
The Washoe Copper Companys at
Anaconda, which is the largest in the
world. is constructed OF brick and is
30 feet inside diameter and 300 feet
high; the Metropolitan Street Railway
company's, New York city, of brick,
% feet inside diameter, 1853 feet high;
the Clark Thread works, Kearney, N.
j.. of brick, II feet inside chimney,
1856 feet high; Omabe and Grant smelt-
er. Denver, Col. of brick, 16 feet in
side diameter, $50 feet high; Oxford
Copper Company's Constable Hook,
N. j.. radial brick, 20 feet inside
diameter at the base, 10 feet at the
top. 800 feet high; Tacoma Smelling
works. Tacoma, Wash, concrete, Is
feet inside diameter. 300 feet high.