again in front of the tuyere and one by one agglomerated into a ball. That heterogeneous iron was full of slag and the carbon content ranged from pure iron to nearly pig iron. It was therefore reheated in a chafery and hammered and folded using a waterwheel powered trip hammer.

The ore from Dannemora was very low in sulphur and high in manganese. It is possible the manganese bonded with the impurities