A Book of Dartmoor: Second EditionBaring-Gould, S. (Sabine)
History
A Book of Dartmoor: Second Edition
Baring-Gould, S. (Sabine)
Dartmoor (England)
There can exist little doubt that Ictis is the same as Vectis, the
Isle of Wight. It is held that anciently the island was connected with
the mainland. The Roman station and harbour was at Brading. The early
workers first pounded the ore with stone crushers, and such have been
found. They then fanned it in the wind, which carried off the fine
light dust, and left the metal on the shovels on which they tossed
the ore and grit into the air. Beside some of the workings heaps of
this dust have been detected. The washing of the ore came later. When
sufficient had been collected, long troughs were sunk in the "calm,"
or native clay, and these were filled with charcoal; then the tin ore
was laid on this charcoal, and either more of this latter was heaped
above, or else peat was piled up, with layers of ore. Finally the whole
was kindled. No bellows were used, but a draught through the channel
kept the whole glowing, and the metal ran through the fire into the
bottom of the hollow, or ran out at the end, as this rude furnace was
constructed on an incline.
[Illustration: MORTAR-STONE, OKEFORD.]
In Staffordshire, at Kinver, and in the neighbourhood of Stourbridge,
in Worcestershire, I have seen banks and hedges made up of what are
locally called _burrs_. These consist of masses of sand and iron slag,
two feet in diameter, round, and concave on one side, convex on the
other. These burrs were formed in the primitive manufacture of iron,
which much resembled that of tin. Andrew Yarranton, in _England's
Improvement by Sea and Land_, 1698, says that he saw dug up near the
walls of Worcester the hearth of an old Roman iron-furnace.
"It was an open hearth upon which was placed alternately charcoal
and ironstone, to which fire being applied; it was urged by men
treading upon bellows. The operation was very slow and imperfect.
Unless the ore was very rich, not more than one hundredweight of
iron could be extracted in a day. The ironstone did not melt, but
was found at the bottom of the hearth in a large lump or bloom,
which was afterwards taken out and beaten under massive hammers
previous to its being worked into the required shape or form."
The _burrs_ found are the sand and iron mixed that encased the _bloom_,
which was taken out by pincers and worked on the anvil. The scoria that
encased the bloom was thrown aside, and yet contains more than one-half
of iron. The iron reduced in this simple manner never ran, but it
became soft like dough, and could be removed and beaten into shape.
The method of dealing with the tin was similar, only that in this
latter case the metal flowed. That foot bellows were employed before
the system of working bellows, and producing a continuous blast by
means of a water-wheel, is most probable. The foot bellows are known to
most primitive people, but in Agricola's illustration of the smelting
of tin none are shown. On the contrary, Æolus is represented in the
corner as blowing a natural blast.
Public-domain text, read in full here on John Shaqi.
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