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Claim 1

A PNEUMATIC FORCE BALANCE INSTRUMENT RESPONSIVE TO A PNEUMATIC PRESSURE COMPRISING, IN COMBINATION, A BALANCE MEANS TILTABLE ABOUT AN ADJUSTABLE PIVOT MEANS, A PNEUMATIC SYSTEM INCLUDING A NOZZLE MOUNTED FOR EFFECTIVE COOPERATION WITH SAID BALANCE MEANS AND A FORCE OF AIR UNDER PRESSURE FOR SUPPLYING AIR TO SAID NOZZLE, WHEREBY TILTING OF SAID BALANCE MEANS VARIES THE AIR FLOW TO SAID NOZZLE TO VARY THE PRESSURE IN SAID SYSTEM, A FIRST ELEMENT BEARING AGAINST SAID BALANCE MEANS AND BEING YIELDABLY RESPONSIVE TO A RESTRICTED VALUE OF A PRESSURE REPRESENTATIVE OF A FIRST MEASURED CONDITION, A FIRST ADJUSTABLE RESTRICTION MEANS OF RESTRICTING SAID PNEUMATIC PRESSURE REPRESENTATIVE OF A FIRST MEASURED CONDITION, A SECOND ELEMENT BEARING AGAINST SAID BALANCE MEANS AND BEING YIELDABLY RESPONSIVE TO SAID PNEUMATIC PRESSURE IN SAID SYSTEM, OF SAID PNEUMATIC FORCE BALANCE INSTRUMENT, A THIRD ELEMENT BEARING AGAINST SAID BALANCE MEANS AND BEING YEILDABLY RESPONSIVE TO SAID PNEUMATIC PRESSURE IN SAID SYSTEM, A FOURTH ELEMENT BEARING AGAINST SAID BALANCE MEANS AND BEING YIELDABLY RESPONSIVE TO A RESTRICTED VALUE OF SAID PNEUMATIC PRESSURE IN SAID SYSTEM, AND A SECOND ADJUSTABLE RESTRICTION MEANS OF RESTRICTING SAID PNEUMATIC PRESSURE IN SAID SYSTEM, SAID FIRST AND SAID SECOND RESTRICTION MEANS ADJUSTED SO THAT R1C1 EQUALS R2C2 WHEREIN R1 IS THE RESISTANCE OF SAID FIRST RESTRICTION MEANS, R2 IS THE RESISTANCE OF SAID SECOND RESTRICTION MEANS, C1 IS THE CAPACITANCE OF SAID FIRST ELEMENT AND C2 IS THE CAPACITANCE OF SAID SECOND ELEMENT, WHEREBY A PRESSURE IS ESTABLISHED IN SAID SYSTEM THAT IS AN INTEGRATED VALUE OF SAID MEASURED CONDITION.