Chapter 15

CHAPTER XV

THE FETE OF THE CASTING

During the eight months which were employed in the work of
excavation the preparatory works of the casting had been carried
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
quantity far too costly to send by railway. The cost of
transport would have been double that of material. It appeared
preferable to freight vessels at New York, and to load them with
the iron in bars. This, however, required not less than sixty-
eight vessels of 1,000 tons, a veritable fleet, which, quitting
New York on the 3rd of May, on the 10th of the same month ascended
the Bay of Espiritu Santo, and discharged their cargoes, without
dues, in the port at Tampa Town. Thence the iron was transported
by rail to Stones Hill, and about the middle of January this
enormous mass of metal was delivered at its destination.

It will easily be understood that 1,200 furnaces were not too
many to melt simultaneously these 60,000 tons of iron. Each of
these furnaces contained nearly 140,000 pounds weight of metal.
They were all built after the model of those which served for
the casting of the Rodman gun; they were trapezoidal in shape,
with a high elliptical