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automatic elevators begin to appear as early as the 1930s their development being hastened by striking elevator operators whits brought large cities development on skyscrapers (and therefore their elevators) such as new your and chicago to their knees. these electromechanical systems used relay logic circuits of increasing complexity to control the speed, position and door operation of an elevator or bank of elevators.
the otis autotronic system of the early 1950s brought the earliest predictive system which could anticipate traffic patterns within a building to deploy elevator movement in the most efficient manner. relay-controlled elevator systems remained common until the 1980s and their gradual replacement with solid-state, microprocessor-based controls are now the industry standard. most older, manually-operated elevators have been retrofitted with automatic or semi-automatic controls.
