Mortons seed drill, 1828.
UNITED KINGDOM - JUNE 13: This model represents an improved version of the grain drill sowing machine devised by S Morton in Edinburgh in 1828. Seeds were passed from a hopper by means of grooved rollers driven by the large land wheel. This ensured an even sowing rate per yard regardless of machine speed. In addition, sowing rate and depth could be adjusted manually to suit the farmer�s requirements. (Photo by SSPL/Getty Images)

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來源: Science & Society Picture Library / Contributor
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