There are a number of myths that have grown up around emergency stops over the years. These myths can lead to injury or death, so it's time for a little myth busting. The emergency stop is a safety device. Early in the Industrial Revolution, machine builders realized that users needed a way to quickly stop a machine when something went wrong. At that time, machines were powered by overhead line shafts driven by large central power sources like waterwheels, steam engines or large electric motors. Machinery was coupled to the central shafts with pulleys, clutches and belts, which transmitted the power to the machinery.
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