Liquid quantity gage

Claim 1

IN A LIQUID MEASURING SYSTEM FOR DETERMINING THE QUANTITY OF LIQUID IN A TANK IN WHICH A SENSING CAPACITOR IS IMMERSED IN SAID TANK, SAID SENSING CAPACITOR COMPRISING IN COMMBINATION TWO ELECTRODE MEMBERS OF DIFFERENT DIAMETERS, INSULATING MEANS FOR MOUNTING SAID MEMBERS IN SPACED RELATION TO EACH OTHER, THE FIRST OF SAID MEMBERS COMPRISING A TUBE OF METALLIC MATERIAL HAVING ON A PART ONLY OF A SURFACE THEREOF A CONDUCTIVE SURFACE, SAID CONDUCTIVE SURFACE BEING INSULATED FROM SAID FIRST MEMBER AND BEING IRREGULARLY SHAPED AND SO RELATED TO THE SHAPE OF THE CONTAINER THAT THE CIRCUMFERENTIAL EXTENT OF SAID LAYER AT ANY GIVEN DEPTH OF LIQUID IS PROPORTIONAL TO THE SURFACE AREA OF THE LIQUID, AT THAT DEPTH, THE SECOND OF SAID ELECTRODE MEMBERS COMPRISING A TUBE OF METALLIC MATERIAL PLACED AROUND THE FIRST OF SAID MEMBERS, SAID SENSING CAPACITOR RESPONSIVE TO THE LEVEL OF LIQUID THEREIN TO PROVIDE A FIRST CAPACITANCE VALUE WHICH IS A FUNCTION OF THE DIELECTRIC CONSTANT OF SAID LIQUID AND THE QUANTITY THEREOF IN SAID TANK, A WET COMPENSATOR CAPACITOR IMMERSED IN A PREDETERMINED QUANTITY OF SAID LIQUID TO PROVIDE A SECOND CAPACITIVE VALUE WHICH IS A FUNCTION OF SAID DIELECTRIC CONSTANT AND IS INDEPENDENT OF SAID QUANTITY, A DRY REFERENCE CAPACITOR PROVIDING A THIRD AND FIXED CAPACITIVE VALUE, A BRIDGE CURRENT COMPRISING SAID CAPACITORS AND PROVIDED WITH A FIRST BRANCH HAVING ADJUSTABLE MEANS TO APPLY A FIRST ALTERNATING VOLTAGE THROUGH SAID WET AND DRY CAPACITORS IN INVERSE RELATIONSHIP WHEREBY AN INCREASE