Steam Engine
Criterion D Test
The steam engine has been a really important invention for the industrialization. It has been really useful and has impacted the world in many ways. The creation of the steam engine has affected positively and negatively in everybody's life, the health, the economy, the human rights, the politics and the environment.
The creation of a good functional steam around 60 years. In 1698 Thomas Savery patented the idea of the steam engine. Then Thomas Newcome made a huge improvement for it to be functional and was placed in a mine to pump water, but not anything major. Finally James Watt improved it in 1769 and made the first commercial, functional steam engine and was used to move objects, such as trains. The steam engine normally powered all the early locomotives such as steamboats, trains and factories.
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First of all they use coal and water to make the steam, then all the steam goes to a side of the cylinder (the cylinders is divided in two by the piston) and the high pressure steam exhausts and cools down, this causes the piston to move the opposite direction where the high pressure steam is applied. This piston movement is what causes the movement on the locomotive. Then once again, high pressure steam enters the engine to the other side of the cylinder (slide valve moves to let the steam enter certain side) and pushes the piston to the opposite side causing the exhausted steam to exit and also causing piston movement. It becomes a continuous cycle and the piston moves from side to side. Trains usually use cross-head to link to a drive rod, and then to coupling rods that drive the wheels. The cross-head is connected to a drive rod that connects to one of three drive wheels for the train. The three wheels are connected via coupling rods so they turn in