An lift (or elevator) is a transport device used to move goods or people vertically, from one floor to another.
A modern day lift consists of a cab (also called a "cage" or "car") mounted on a platform within an enclosed space called a shaft. In the past, lift drive mechanisms were powered by steam and water hydraulic pistons. In a "traction" lift, cars are pulled up by means of rolling steel ropes over a deeply grooved pulley.
The weight of the car is balanced with a counterweight. Sometimes two lifts always move synchronously in opposite directions, and they are each other's counterweight.
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