Liquid volume measuring arrangement

Claim 1

A LIQUID VOLUME MEASURING ARRANGEMENT FOR MEASURING THE VOLUME OF A LIQUID IN A TANK COMPRISING, IN COMBINATION, PRESSURE INDICATING MEANS; PRESSURE SENSITIVE MEANS FOR TRANSMITTING A PRESSURE VARIATION TO SAID PRESSURE INDICATING MEANS; A TUBE POSITIONED IN SAID TANK AND EXTENDING FROM THE TOP TO THE BOTTOM OF SAID TANK IN A SUBSTANTIALLY VERTICAL DIRECTION; BUOYANT MEANS COUPLED TO SAID PRESSURE SENSITIVE MEANS AND EXTENDING INTO SAID TUBE IN SAID TANK BELOW THE LEVEL OF A LIQUID TO BE MEASURED IN SAID TANK FOR APPLYING A FORCE TO SAID PRESSURE SENSITIVE MEANS TO PRODUCE A PRESSURE VARIATION WHICH IS INDICATED BY SAID PRESSURE INDICATING MEANS, SAID FORCE HAVING A DETERMINED RELATION TO THE VOLUME OF THE LIQUID TO BE MEASURED IN SAID TANK; AND AUXILIARY MEANS UTILIZING THE LIQUID TO BE MEASURED FOR PROVIDING AND MAINTAINING IN SAID TUBE AT THE LEVEL OF THE LIQUID TO BE MEASURED IN SAID TANK AND IN CONTACT WITH SAID BUOYANT MEANS AN AUXILIARY LIQUID WHICH IS HEAVIER THAN THE LIQUID TO BE MEASURED AND NON-ADHERENT TO SAID BUOYANT MEANS, SAID AUXILIARY MEANS COMPRISING A CHAMBER FOR STORING SAID AUXILIARY LIQUID, SAID CHAMBER COMPRISING A COMPARTMENT FOR STORING SAID AUXILIARY LIQUID AND ANOTHER COMPARTMENT COMMUNICATING WITH SAID FIRST-MENTIONED COMPARTMENT AND WITH SAID TUBE AND WITH SAID TANK FOR STORING BOTH A PART OF SAID LIQUID TO BE MEASURED AND A PART OF SAID AUXILIARY LIQUID IN A MANNER WHEREBY SAID LIQUID TO BE MEASURED PROVIDES PRESSURE ON SAID AUXILIARY LIQUID TO CAUSE SAID AUXILIARY LIQUID TO FLOW INTO SAID TUBE TO THE LEVEL OF THE LIQUID TO BE MEASURED IN SAID TANK.