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...Tractor hitch control history and future dr ing h hesse ingenieurburo fur hydraulik stuttgart introduction the agricultural at beginning was used to pull carry implements for soil cultivation most of them were ploughs ploughing is a field operation with high energy requirements consumption per area mechanical power farmers could do quicker only few people without animals this one important steps work mechanization hydraulic system introduced lifting lowering headland transportation when switched in float position so that plough worked constant working depth free follow surface even under undulated conditions it harry ferguson son an irish farmer who invented called draft principle his idea still successful inventions engineering principles point linkage connect solution standardized later on now all over world figure ib hy mounted he found wed not transferred because slippage knew wheel slip be reduced or pulling force increased by higher vertical forces wheels can done ballast weights...