Electromechanical analog multiplier which includes a semiconductor bridge circuit

Claim 1

AN ANALOG MULTIPLIER FOR PRODUCING THE PRODUCT OF A FIRST AND A SECOND VARIABLE COMPRISING: AN ELECTRICAL BRIDGE CONSISTING OF A FIRST, A SECOND, A THIRD AND A FOURTH EQUAL SEMICONDUCTOR STRAIN GAGE IMPEDANCES CONNECTED IN SERIES WITH THE FOURTH IMPEDANCE CONNECTED TO THE FIRST IMPEDANCE TO FORM A CLOSED LOOP; MEANS FOR APPLYING BETWEEN THE JUNCTION OF SAID FIRST AND FOURTH IMPEDANCES AND THE JUNCTION OF SAID SECOND AND THIRD IMPEDANCES AN ELECTRICAL SIGNAL WHOSE AMPLITUDE IS PROPORTIONAL TO SAID FIRST VARIABLE; MEANS INCLUDING A CANTILEVER BEAM FOR COMPRESSING AND THEREBY INCREASING THE IMPEDANCE IN EACH OF SAID FIRST AND THIRD IMPEDANCES IN AMOUNTS PROPORTIONAL TO SAID SECOND VARIABLE; AND MEANS INCLUDING SAID CANTILEVER BEAM FOR EXTENDING AND THEREBY DECREASING THE IMPEDANCE IN EACH OF SAID SECOND AND FOURTH IMPEDANCES IN AMOUNTS EQUAL TO THE AMOUNTS THAT THE IMPEDANCE IN SAID FIRST AND THIRD IMPEDANCES ARE INCREASED WHEREBY THE SIGNAL PRODUCED BETWEEN THE JUNCTION OF THE FIRST AND SECOND IMPEDANCES AND THE JUNCTION OF THE THIRD AND FOURTH IMPEDANCES HAS AN AMPLITUDE PROPORTIONAL TO THE PRODUCT OF SAID FIRST AND SECOND VARIABLES.