The diving pool at the London Olympics has to be a minimum depth of 4.5 meters, but the preferred depth is 5 meters (16 feet 4 inches).8 people found this useful.he diving pool at the London Olympics has to be a minimum depth of 4.5 meters, but the preferred depth is 5 meters (16 feet 4 inches). 8 people found this useful.
Positive feedback mechanism. A process whereby an initial change in an atmospheric process will tend to either reinforce the process (positive feedback) or weaken the process (negative feedback). See Feedback mechanism.
The windmill fantail is an earlier example of automatic control, but since it does not have an amplifier or gain, it is not usually considered a servomechanism. The first feedback position control device was the ship steering engine, used to position the rudder of large ships based on the position of the ship's wheel.