Elevators
Elevators, a device for vertical transportation of passengers or freight to different floors or levels, as in a building or a mine. ... Elevators generally consist of a platform or car traveling in vertical guides in a shaft or hoist way. ...
Rudimentary elevators, or hoists, were in use during The Middle Ages and can be traced back to the third century BC. ... In the early 19th century, hydraulic plunger elevators were used in some European factories. ... Later in the 19th century, Elisha Graves Otis’s sons went on to make mass productions of elevators. ... Since the introduction of this new electric motive power for elevators, various improvements have been made in motors and methods of control. ... Just about all-commercial elevators operate automatically, and the use of computers has maximized efficiency and extreme safety.
The use of automated computers eventually eliminated the need for starters at the ground level of large commercial buildings, making the operation of elevators completely automatic.
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