It consists of an armature mounted on the same shaft with a rotating circuit controller, a constantly energized field coil acting on the armature, and an ... If the speed is greater than that at which segment (1) has been set, the controller, being rotated in proportion to the speed until the contact ... It may be a 12-volt portable type.
|Title||:||The Railway Engineer|
|Author||:||Lawrence Saunders, S. R. Blundstone|