Harry Ferguson's prototype tractor

'Ferguson Black' tractor, 1935.
The black tractor developed by Harry Ferguson (a prolific Irish inventor) represented a huge advance in mechanisation on the farm. Not only did it pull the plough, but a special hydraulic system allowed the depth of the plough top be controlled from the tractor. A feature called three-link suspension prevented the tractor from rearing over backwards if the plough snagged on a below-ground obstruction.
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