What distinguishes an automatic elevator from a manual elevator?

An automatic elevator is characterized by its ability to operate without manual intervention, which is the key distinction from a manual elevator. In an automatic system, the elevator doors open and close automatically, and the operation is controlled by a computerized system that enables the elevator to respond to calls at different floors without requiring an operator to control the movement. This allows passengers to simply enter the elevator, press a button for their desired floor, and the elevator takes them there autonomously.

In contrast, a manual elevator requires an operator to control its functions, including calling the elevator, opening and closing the doors, and selecting the floor. The lack of automation in a manual system means that it involves more hands-on operation, making it less efficient and convenient compared to an automatic elevator.

Other distinguishing factors, such as control panel location, power source, or size, are not definitive in categorizing elevators as automatic or manual. For instance, both types can have similar control panel locations or sizes, and both can potentially be powered by similar sources. Therefore, the operational capability without manual input clearly defines the automatic elevator's functionality.