Day in, day out we have been using elevators. Nowadays it is difficult to imagine buildings without elevators. Do we know what makes this elevator work?
Have you ever faced a situation when the elevator door on the floor opens and there is no elevator car ? (like in a terror movie)
How do these elevators work? how are doors controlled automatically and what are the safety measures that are built in a elevator?
Check out here to know how elevators work... http://science.howstuffworks.com/elevator.htm
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