Capacitance pickoff with low coercion

Claim 1

THE COMBINATION IN A SYSTEM FOR MEASURING ACCELERATIONS, OF: A SUPPORTING STRUCTURE FIXED TO THE DEVICE OF WHICH THE ACCELERATION IS TO BE MEASURED; A PROOF MASS MOVABLY MOUNTED IN SAID SUPPORTING STRUCTURE; A TRANSFER CYLINDER FIXED TO SAID PROOF MASS, BUT INSULATED THEREFROM AND ADAPTED FOR MOVEMENT WITH SAID PROOF MASS IN A DIRECTION NORMAL TO THE AXIS OF SAID CYLINDER ON EITHER SIDE OF A NULL POSITION; AN OUTPUT TERMINAL MEMBER DISPOSED WITHIN SAID TRANSFER CYLINDER COAXIALLY WITH THE NULL POSITION THEREOF; SEPARATED PICKUP MEMBERS DISPOSED SYMMETRICALLY WITH RESPECT TO SAID TRANSFER CYLINDER; MEANS FOR EXCITING SAID PICKUP MEMBERS IN PHASE OPPOSITION, SAID MEANS HAVING A CENTER TAP OUTPUT CONNECTION; AND MEANS CONNECTED TO SAID OUTPUT CONNECTION AND TO SAID OUTPUT TERMINAL MEMBER ADAPTED TO COMMUNICATE WITH SERVO CIRCUIT MEANS ARRANGED TO SUPPLY POSITION RESTORING FORCES TO SAID PROOF MASS; AND MEANS FOR UTILIZING THE VALUE OF SAID CORRECTIVE FORCE AS A MEASURE OF THE ACCELERATION EXPERIENCED BY SAID PROOF MASS.