
INDUSTRIAL REVOLUTION
ESCALATOR
The Escalator
The escalator was invented to move large numbers of people from one floor to another, in a faster and more efficient way. Escalators are electrically powered, driven by chain and sprocket, and held in the proper plane by two tracks. As the treads approach the landing, they pass through a comb device. This comb device is a deflection switch that is designed to cut off power if an object becomes jammed between the thread and comb. Most escalators move at a rate of 120 feet per minute. Escalators can take people up and down.
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