Liquid level measuring system

Claim 1

IN COMBINATION WITH A LIQUID STORAGE VESSEL TO BE MOUNTED ON A CARRIER SUBJECT TO MOVEMENT SUCH AS ROLL, PITCH, YAW OR ACCEELERATIONS, IN A NUMBER OF DIRECTIONS, TO CAUSE THE LIQUID SURFACE TO HAVE THREE-DIMENSIONAL MOVEMENT, WHEREIN THE FILL LEVEL OF SAID LIQUID MAY VARY FROM A LOW LEVEL TO A HIGH LEVEL AS OBSERVED IN THE ABSENCE OF SAID MOVEMENT AND WHILE SAID VESSEL OCCUPIES A NORMAL UPRIGHT POSITION, APPARATUS FOR MEASURING THE TRUE VALVE OF SAID FILL LEVEL IN THE PRESENCE OR ABSENCE OF SAID MOVEMENT, SAID APPARATUS COMPRISING THREE ELONGATED RADIATION DETECTORS SPACED AROUND THE PERIPHERY OF SAID VESSEL AND EACH EXTENDING FROM ABOVE SAID HIGH LEVEL TO ABOVE SAID LOW LEVEL, MEANS LOCATED ABOVE SAID HIGH LEVEL FOR IRRADIATING THOSE PORTIONS OF SAID DETECTORS WHICH ARE ABOVE THE SURFACE OF SAID LIQUID WHEREBY EACH OF SAID DETECTORS GENERATES A SIGNAL INDICATIVE OF THE HEIGHT OF A RESPONSIVE POINT IN THE PLANE OF THE SURFACE OF SAID LIQUID, AND MEANS FOR COMBINING THE SIGNALS FROM SAID THREE DETECTORS TO PRODUCE A RESULANT SIGNAL INDICATIVE OF SAID TRUE VALVE OF SAID FILL LEVEL.