Grounded wiper indicator circuit

Claim 1

AN ELECTROMAGNETIC INDICATOR CIRCUIT FOR ANGULARLY DISPLACING A ROTATABLY MOUNTED MAGNETIC AMRATURE IN RESPONSE TO CHANGING CONDITIONS AT A REMOTE POINT, THE CIRCUIT COMPRISING THE COMBINATION OF FIRST AND SECOND ELECTROMANETIC COILS RELATIVELY DISPOSED SUCH THAT THE MAGNETIC AXES THEREOF INTERSECT AT A PREDETERMINED ANGLE, FIRST AND SECOND IMPEDANCE ELEMENTS, A SOURCE OF POTENTIAL HAVING ONE TERMINAL CONNECTED TO A POINTT OF REFERENCE POTENTIAL AND THE OTHER TERMINAL CONNECTED COMMONLY TO ONE SIDE OF EACH OF THE FIRST AND SECOND IMPEDANCE ELEMENTS, THE FIRST AND SECOND COILS EACH HAVING ONE SIDE CONNECTED TO THE POINT OF REFERENCE POTENTIAL AND THE OTHER SIDES BEING RESPECTIVELY CONNECTED TO THE OTHER SIDES OF THE FIRST AND SECOND IMPEDANCE ELEMENTS, A THIRD IMPEDANCE ELEMENT CONNECTED ACROSS THE OTHER SIDES OF THE FIRST AND SECOND COILS, DISPLACEABLE CONTACT MEANS CONNECTED TO THE POINT OF REFERENCE POTENTIAL AND ADAPTED TO BE DISPLACED ALONG, BUT IN CONTACT WITH, THE THIRD IMPEDANCE ELEMENT IN RESPONSE TO THE CHANGING CONDITIONS WHEREBY THE VOLTAGES IMPRESSED ACROSS THE FIRST AND SECOND COILS BY THE SOURCE O POTENTIAL ARE RECIPROCALLY VARIED, THE FIRST AND SECOND COILS BEING DISPOSED ABOUT THE MAGNETIC ARMATURE WHEREBY THE ARMATURE WILL BE ALIGNED WITH THE RESULTANT ELECTROMAGNETIC FIELD FROM THE COILS.