Flow meter

Claim 1

A FLOW METER COMPRISING A LENGTH OF PIPE HAVING AN ORIFICE THEREIN, AN ELECTRO-MECHANICAL TRANSDUCER HAVING A MECHANICAL INPUT AND ELECTRICAL OUTPUT, MEANS CONNECTING THE MECHANICAL INPUT OF THE TRANSDUCER TO THE PIPE TO RESPOND TO THE PRESSURE DROP ACROSS THE ORIFICE, A POTENTIOMETER INCLUDING FIRST AND SECOND ENDS AND A CENTER TAP, ELECTRIC CONDUCTOR MEANS CONNECTING THE ENDS OF THE POTENIOMETER TO THE ELECTRIC OUTPUT OF THE TRANSDUCER, MEANS RESPONSIVE TO THE STATIC PRESSURE IN THE PIPE ON ONE SIDE OF THE ORIFICE TO VARY THE DISTANCE OF THE CENTER TAP OF THE POTENTIOMETER FRON ONE END THERETO IN PROPORTION TO THE VARIATIONS IN SAID STATIC PRESSURE, A MAGNETIC AMPLIFIER OF THE SATURABLE REACTOR TYPE INCLUDING A CONTROL WINDING, A BIAS WINDING, AND A FEEDBACK WINDING, MEANS CONNECTING SAID BIAS WINDING TO A SOURCE OF DIRECT CURRENT POTENTIAL, MEANS INCLUDING A FIRST RESISTOR IN SERIES WITH THE FEEDBACK WINDING CONNECTING SAID FEEDBACK WINDING AND FIRST RESISTOR ACROSS THE OUTPUT OF THE MAGNETIC AMPLIFIER, SAID FEEDBACK WINDING BEING WOUND FOR POSITIVE FEEDBACK, A SQUARE ROOT NETWORK INCLUDING SECOND AND THIRD RESISTORS CONNECTED IN SERIES ACROSS THE OUTPUT OF THE AMPLIFIER AND A FOURTH RESISTOR SERIES CONNECTED TO THE AMPLIFIER OUTPUT TERMINAL TO WHICH SAID SECOND RESISTOR IS CONNECTED AND A SOURCE OF DIRECT CURRENT, SAID SQUARE ROOT NETWORK FURTHER INCLUDING A PLURALITY OF RECTIFIERS EACH CONNECTED IN SERIES WITH A PORTION OF SAID FOURTH RESISTOR AND THE JUNCTURE OF SAID SECOND AND THIRD RESISTORS, AND ELECTRIC CONDUCTOR MEANS CONNECTING IN SERIES SAID THIRD RESISTOR, SAID CONTROL WINDING AND THE PORTION OF SAID POTENTIOMETER BETWEEN SAID ONE END SAID CENTER TAP.