Ball elevators are a type of machine used to transport balls from one level to another. They are commonly used in sports such as golf, tennis, and basketball, as well as in amusement parks. The term 'ball elevators' is derived from the fact that they use a system of pulleys and cables to lift the balls up and down. The term 'tees' is used to refer to the platforms on which the balls are placed before being lifted. Ball elevators are an important part of many sports and recreational activities, providing a safe and efficient way to move balls between levels.