Fluid flow measuring and computing apparatus

Claim 1

A MULTIPLIER SYSTEM, SAID MULTIPLIER SYSTEM INCLUDING A FIRST DEVICE PRODUCING A VOLTAGE PROPORTIONAL TO A FIRST VALUE, AN AMPLIFYING DEVICE RESPONSIVE TO SAID VOLTAGE TO PRODUCE A CURRENT, AND A THIRD DEVICE PRODUCING A FURTHER VOLTAGE VARYING IN ACCORDANCE WITH A SECOND VALUE, SAID AMPLIFYING DEVICE HAVING FEEDBACK MEANS ARRANGED TO OPPOSE A FEEDBACK VOLTAGE TO THE FIRST SAID VOLTAGE, SAID FEEDBACK VOLTAGE BEING GENERATED BY SAID CURRENT, AND SAID THIRD DEVICE BEING RESPONSIVE TO SAID CURRENT TO CAUSE SAID FURTHER VOLTAGE TO VARY IN ACCORDANCE WITH SAID CURRENT; SAID FEEDBACK MEANS INCLUDING IMPEDANCE MEANS VARIABLE FOR CONTROLLING THE AMOUNT OF SAID FEEDBACK, SAID IMPEDANCE MEANS BEING OPERABLE IN ACCORDANCE WITH A THIRD VALUE TO MAKE SAID AMOUNT OF SAID FEEDBACK VARY IN PROPORTION TO SAID THIRD VALUE WHEREBY SAID FURTHER VOLTAGE IS REPRESENTATIVE OF THE PRODUCT OF THE SAID FIRST AND SECOND VALUES DIVIDED BY THE SAID THIRD VALUE.