Over the course of the eighteenth century, the average output of ironwork tripled as a result of several improvements in blowing machinery and because coal replaced charcoal as the fuel used in the smelting of iron ore.
Original question shows 2 reasons that make the average output of ironwork triple.
1.Improvements in blowing machinery
2.Replacement of coal.
A.Over the course of the eighteenth century, the average output of ironwork tripled as a result of several improvements in blowing machinery
...
Original question shows 2 reasons that make the average output of ironwork triple.
1.Improvements in blowing machinery
2.Replacement of coal.
A.Over the course of the eighteenth century, the average output of ironwork tripled as a result of several improvements in blowing machinery
...
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