Page's Revolving Armature
   Charles Grafton Page invented the  Revolving Armature in February 1838. It uses the same mechanism as the  revolving armature engine : the ends of a pivoted iron bar are drawn toward the poles of an electromagnet, and, as they approach closely to the poles, a commutator breaks the circuit, and the angular momentum of the bar carries it on to the next time that the magnet is energized. 

   The current through the coils thus turns on and off. This property make it possible to use the revolving armature as an interrupter or electrotome for the conversion of a direct current into pulsating current. This use is shown below with a small double helix used for medical electricity.

                                                                                                                                        Middlebury College

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