18世纪,用畜力牵引原始木犁,手工播种,用锄头中耕,用镰刀收割草和谷物,用枷打击脱粒。18世纪90年代,引进了配禾架及长柄镰刀;1793年,发明了轧棉机;1794年,托马斯·杰斐逊的最小阻力犁板通过测试;1797年,查尔斯·纽邦德发明了铸铁犁。1819年,杰斯如·伍得取得部件可更换的铁制犁 In the 18th century, wood plows were drawn with animal power, hand-sown, hoe plowed, grass and grain harvested with sickles, and threshed with flails. In the 1890s, there was the introduction of a scaffold and scythe, the invention of a cotton gin in 1793, the passage of Thomas Jefferson’s smallest resistance plow in 1794, and in 1797 Charles Newbond invented a cast-iron plow. In 1819, Jesse Wood got a replaceable iron plow