The production of iron required high temperatures
and a reducing environment. The high calorific value and low ash
content of charcoal made it ideal for burning, but considerable
quantities were required to fuel the iron forges. The vast amount
of charcoal needed by Fountains concerned the magnate, John de
Mowbray, who feared that by stripping the woodland of shelter for
the wild animals, the monks would compromise his hunting. John’s
concerns gave rise to an agreement in 1309. This stated that the
community might have only one forge in Nidderdale, in addition
to the forge at Dacre, it stipulated that the monks might make
as much charcoal as they wished between 29th September and Easter,
but at no other time, and that they might only do so in the woodlands
on their Nidderdale estates. Other terms of the agreement shed
light on the nature of iron smelting, and reveal that this additional
forge might have two furnaces and be moved around, so that the
monks could make iron in the most convenient spots.(139)
Water v foot power
Fixed mills could be powered by a water wheel, but portable forges were
powered by a foot-blast.
[Jennings, Yorkshire Monasteries, p. 99]
Current research
conducted by the Department of Archaeological Sciences at the University
of Bradford, is investigating and evaluating
the importance of iron to the Rievaulx community and the effect
of the monks’ industry on the landscape.
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