What mechanism is used to keep the cylinder and movable contacts stationary until the handle of the drum controller is moved by the operator?
What will be an ideal response?
The handle can remain stationary in either the forward or reverse direction due to a roller and a notched wheel. A spring forces the roller into one of the notches at each successive position of the controller handle to keep the cylinder and movable contacts stationary until the handle is moved by the operator.
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What will be an ideal response?
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