The Stump-Jump Plough
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In the 1800's, farmers were settling down in South Australia where there were many mallee trees. When a mallee tree was cut down, it would try to reproduce. The tactic was to keep on burning the shoots overtime, yet the old roots were resitant to fire. It was hard to plough the ground while there was an old stump blocking its way for farmers, and the farmers were very frustrated about this. They were getting desperate to find a solution and in 1876, Richard Boyer Smith and Clarence Herbet Smith developed a unique plough that when it came into contact with an old root, it would raise the plough off the ground and back onto the ground when the stump was behind them. This was reveloutionary for ploughing, worldwide.
The coolgardie safe
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Before the refrigerator, people couldn't refrigerate their food. Until in 1892, Arthur Patrick McCormick discovered that when he put a damp bag over a bottle, it made the liquid inside the bottle colder. So he used that particular theory to make the coolgardie safe. How Arthur Patrick McCormick made the coolgardie safe was that he would construct a metal or wood frame and cover it in wire mesh(make sure you have 4 wooden or metal legs), have a galvanised iron tray filled with water on the top, hessian bags on all four sides of the safe (the top of the hessian bags have to be touching the water) and sit it where some brreze would go through, with the food inside and voila, one of the first refrigeration use in the world!