Jethro Tull's seed drill, 1701.
© Science Museum / Science & Society Picture Library
Model (scale 1:4). Jethro Tull's seed drill represented a major step towards the mechanisation of soil cultivation. The machine would be drawn by a horse and sowed three regularly spaced rows of wheat grains. This regular spacing, as opposed to broadcast sowing of seeds, made posible the introduction, also by Tull, of a horse-drawn hoe to remove weeds growing amongst the crop.