1. Evolution of machinery
At school there are computers, pianos, overhead projectors and plows for maintaining the playing field. ... John Deere designed the first cast steel plow, which greatly assisted the Great Plains farmers. The plow was made of wrought iron and had a steel share that could cut through sticky soil without clogging. John Deere may have been the most successful plow inventor, however, Charles Newbold was the first inventor of the practical plow, and he did so by creating a cast iron plow in 1797. ... The early tools, steam engine, cotton gin, and the harrowing plow have developed beyond wh...
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