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When tractors were first developed, they used enormous steam engines which were notoriously unreliable and challenging to maintain. These were phased out round the turn in the 20th century and substituted with internal combustion engines that have been more compact yet still powerful and ran on the variety of fuels including kerosene, ethanol and gasoline. By the 1960s many of these engines were phased out and only more effective internal combustion engines that ran on diesel and after this, biodiesel. 9. Their emotional appeal Of course, if you want to choose one of your own photographs, pictures or an image you find on a website as your background, find the image and right-click on its icon. Choose "Set image as desktop background" and it will become your new theme. To save it as a theme for future use, open the Personalize option again and click "Save theme." Now you can reuse it again and again without having to hunt for the original image. Diesel engines are becoming the predominant power behind modern tractors simply because they have the highest thermal efficiency of the internal or external combustion engine, due to their higher than normal compression ratio. Unlike gasoline engines, the diesel engines in tractors use highly compressed hot air to ignite the fuel as opposed to spark plugs.