This is a model of a double furrow stump-jump plough made by Albert Arnold between 1882 and 1883. Stump-jump mouldboard ploughs were an Australian innovation and became the most sophisticated of all ploughs. After clearing the land of trees, the stumps and rocks left hidden in the ground destroyed the shares and mouldboards of many of the imported ploughs regardless of how strongly they were made.
The stump-jump plough was invented by Richard (Robert) Bowyer Smith of Kalkabury (Arthurton) on the Yorke Peninsula of South Australia in 1876. In that year he and his brother, Clarence Herbert Smith, constructed a three-furrow plough with, shares which worked independently of each other in a frame so that when any one of them struck a stump or rock it automatically rose, passed over the obstacle and re-entered the ground by way of a counter weight. Later in 1876 Smith exhibited a single-furrow stump-jump plough with a draught chain attached to drag the bottom back in the ground. The 'bridle draught' effect was further developed by W.M. May of Wallaroo and Heithersay of Peterborough in South Australia and soon became widely used on stump-jump ploughs.