Elevator - History, Modern Elevators
An elevator is an enclosed car that moves in a vertical shaft between the multi-story floors of a building carrying passengers or freight. All elevators are based on the principle of the counterweight, and modern elevators also use geared, electric motors and a system of cables and pulleys to propel them. The world's most often used means of mechanical transportation, it is also the safest. The elevator has played a crucial role in the development of the high-rise or skyscraper and is largely responsible for how our cities look today. It has become an indispensable factor of modern urban life.