Cambridge Encyclopedia » Cambridge Encyclopedia Vol. 23

elevator - Design, Modern elevator construction, Elevator safety, Uses of elevators, Types of elevator hoist mechanisms, Controlling elevators

car systems device invention

A device which carries people or objects from one level to another in a building with several floors. The elevator car is moved by a system of cables and pulleys, which link the car to a counterweight, the power usually being generated by electricity (earlier lifting systems had used a variety of methods, such as animal, steam, and water power). The invention of the elevator fostered the development of the skyscraper in modern cities. Following the invention of a safety device by Otis in 1852, the first (steam-powered) passenger elevator was introduced in New York City in 1857. Later improvements have included increased speeds, noise reduction, safety features (such as lighting and alarm systems), the automatic operation of groups of elevators, and two-deck cars (serving two levels simultaneously).

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over 7 years ago

elevator - Design, Modern elevator construction, Elevator safety, Uses of elevators, Types of elevator hoist mechanisms, Controlling elevators