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* The following remarks are by a practical blacksmith,
one of the most experienced men in the gun-trade. In this trade
various qualities of iron are used, and close attention is required
to secure for each purpose the quality of iron peculiarly adapted to it:
The iron in the two spades strongly resembles Swedish or Russian;
it is highly carbonized.
The same qualities are found in both spades.
When chilled in water it has all the properties of steel:
see the piece marked I, chilled at one end, and left soft at the other.
When worked hot, it is very malleable: but cold, it breaks
quite short and brittle.
The great irregularity found in the working of the iron affords evidence
that it has been prepared by inexperienced hands.
This is shown in the bending of the small spade; the thick portion
retains its crystallized nature, while the thin part has been changed
by the hammering it has undergone.