his breakthrough by cooling the underside of the metal rapidly, thus producing 'chilled' iron. As a result, the lower surface was harder than the top one - it therefore wore down more slowly than the upper one did, and the blade was self-sharpening.
Another great advance made by Ransome, in 1808, was the introduction of standardised plough parts, which allowed ploughs to be repaired easily and put back in use by unit replacement. This was quicker and cheaper than having broken parts repaired or remade by a blacksmith.
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