[The Age of Invention by Holland Thompson]@TWC D-Link book
The Age of Invention

CHAPTER V
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Country blacksmiths made ploughs only on order and few had patterns.

Such ploughs could turn a furrow in soft ground if the oxen were strong enough--but the friction was so great that three men and four or six oxen were required to turn a furrow where the sod was tough.
* "History of the United States", vol.I, p.

16.
Thomas Jefferson had worked out very elaborately the proper curves of the moldboard, and several models had been constructed for him.

He was, however, interested in too many things ever to follow any one to the end, and his work seems to have had little publicity.

The first real inventor of a practicable plough was Charles Newbold, of Burlington County, New Jersey, to whom a patent for a cast-iron plough was issued in June, 1797.


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