om the impurities which soiled their
surface. Then coal and ore were arranged in heaps and in successive
layers, as the charcoal-burner does with the wood which he wishes to
carbonize. In this way, under the influence of the air projected by the
blowing-machine, the coal would be transformed into carbonic acid, then
into oxide of carbon, its use being to reduce the oxide of iron, that is
to say, to rid it of the oxygen.

Thus the engineer proceeded. The bellows of sealskin, furnished at its
extremity with a nozzle of clay, which had been previously fabricated
in the pottery kiln, was established near the heap of ore. Using the
mechanism which consisted of a frame, cords of fiber and counterpoise,
he threw into the mass an abundance of air, which by raising the
temperature also concurred with the chemical transformation to produce
in time pure iron.

The operation was difficult. All the patience, all the ingenuity of the
settlers was needed; but at last it succeeded, and the result was a lump
of iron, reduced to a spongy state, which it was necessary to shingle
and fagot, that is to say, to forge so as to expel from it the liquefied
veinstone. These amateur smiths had, of course, no hammer; but they were
in no worse a situation than the first metallurgist, and therefore did
what, no doubt, he had to do.

A handle was fixed to the first lump, and was used as a hammer to forge
the second on a granite anvil, and thus they obtained a coarse but
useful metal. At length, after many trials and much fatigue, on the 25th
of April several bars of iron were forged, and transformed into tools,
crowbars, pincers, pickaxes, spades, etc., which Pencroft and Neb
declared to be real jewels. But the metal was not yet in its most
serviceable state, that is, of steel. Now steel is a combination of iron
and coal, which is extracted, either from the liquid ore, by taking from
it the excess of coal, or from the iron by adding to it the coal which
was wanting. The first, obtained by the decarburation of the metal,
gives natural or puddled steel; the second, produced by the carburation
of the iron, gives steel of cementation.

It was the last which Cyrus Harding intended to forge, as he possessed
iron in a pure state. He succeeded by heating the metal with powdered
coal in a crucible which had previously been manufactured from clay
suitable for the purpose.

He then worked this steel, which is malleable both when hot or cold,
with the hamm