Metering system

Claim 1

A METERING SYSTEM FOR A FLEXIBLE-WALLED COLLAPSIBLE CONTAINER ADAPTED FOR UNDERWATER STORAGE OF LIQUIDS, COMPRISING A SIGNALING DEVICE MOUNTED ON THE UPPER WALL OF SUCH A CONTAINER, SAID SIGNALING DEVICE COMPRISING A LOWER CHAMBER AND AN UPPER CHAMBER, THE UPPER SURFACE OF SAID UPPER CHAMBER COMPRISING A HORIZONTALLY-ORIENTED, FLEXIBLE, PRESSURE RESPONSIVE MEMBRANE EXPOSED TO THE WATER, THE INTERIOR OF SAID LOWER CHAMBER BEING IN COMMUNICATION WITH THE INTERIOR OF SAID CONTAINER, A PASSAGEWAY BETWEEN SAID UPPER AND LOWER CHAMBERS, A ROD DISPOSED IN SAID PASSAGEWAY, THE LOWER END OF SAID ROD EXTENDING INTO SAID LOWER CHAMBER, THE UPPER END OF SAID ROD BEING ATTACHED TO SAID MEMBRANE, A SLOT IN THE SURFACE OF SAID ROD, WHEREBY THE LIQUID CONTENTS IN SAID CONTAINER CAN PASS FROM SAID LOWER CHAMBER ALONG SAID SLOT INTO SAID UPPER CHAMBER, AND MEANS TO CLOSE SAID SLOT WHEN THE PRESSURE OF SAID LIQUID CONTENTS IN SAID UPPER CHAMBER EQUALS THE PRESSURE OF SAID WATER ACTING ON SAID MEMBRANE, THEREBY TO PREVENT FURTHER FLOW OF SAID LIQUID CONTENTS INTO SAID UPPER CHAMBER; A MANOMETER SUPPORTED AT THE SURFACE OF THE WATER; A PRESSURE LINE COMMUNICATING BETWEEN THE INTERIOR OF SAID UPPER CHAMBER AND ONE SIDE OF SAID MANOMETER; AND A PRESSURE LINE COMMUNICATING BETWEEN SAID INTERIOR OF SAID LOWER CHAMBER AND THE OTHER SIDE OF SAID MANOMETER, WHEREBY SAID MANOMETER CAN MEASURE THE PRESSURE DIFFERENCE BETWEEN SAID INTERIORS OF SAID UPPER AND LOWER CHAMBERS.