on simultaneously with extreme rapidity. A stranger arriving at
Stones Hill would have been surprised at the spectacle offered
to his view.

At 600 yards from the well, and circularly arranged around it as
a central point, rose 1,200 reverberating ovens, each six feet
in diameter, and separated from each other by an interval of
three feet. The circumference occupied by these 1,200 ovens
presented a length of two miles. Being all constructed on the
same plan, each with its high quadrangular chimney, they
produced a most singular effect.

It will be remembered that on their third meeting the committee
had decided to use cast iron for the Columbiad, and in particular
the white description. This metal, in fact, is the most
tenacious, the most ductile, and the most malleable, and
consequently suitable for all moulding operations; and when
smelted with pit coal, is of superior quality for all
engineering works requiring great resisting power, such as
cannon, steam boilers, hydraulic presses, and the like.

Cast iron, however, if subjected to only one single fusion,
is rarely sufficiently homogeneous; and it requires a second
fusion completely to refine it by dispossessing it of its last
earthly deposits. So long before being forwarded to Tampa Town,
the iron ore, molten in the great furnaces of Coldspring, and
brought into contact with coal and silicium heated to a high
temperature, was carburized and transformed into cast iron.
After this first operation, the metal was sent on to Stones Hill.
They had, however, to deal with 136,000,000 pounds of iron, a