Liquid reservoir

Claim 1

A LIQUID RESERVOIR WHICH COMPRISES: A VESSEL HAVING AN OUTER WALL AND AN INTERIOR SPACE TO CONTAIN A SUPPLY OF LIQUID, POROUS INTERIOR WALL MEANS WITHIN SAID VESSEL IMMEDIATELY ADJACENT SAID OUTER VESSEL WALL, SAID INTERIOR WALL MEANS SUBSTANTIALLY COMPLETELY ENCIRCLING SAID INTERIOR SPACE OF SAID VESSEL IN A PLURALITY OF INTERSECTING PLANES PASSING THROUGH THE APPROXIMATE CENTER OF SAID SPACE AND DEFINING AT LEAST IN PART ANNULAR PASSAGE MEANS SUBSTANTIALLY COMPLETELY ENCIRCLING SAID INTERIOR SPACE IN EACH OF SAID PLANES, SAID PASSAGE MEANS COMMUNICATING TO SAID INTERIOR SPACE THROUGH PORES IN SAID WALL MEANS, AN OUTLET ON SAID VESSEL OPENING AT ONE END DIRECTLY TO SAID PASSAGE MEANS AND AT THE OTHER END OF THE EXTERIOR OF TAHE VESSEL FOR COMMUNICATING SAID PASSAGE MEANS TO A PRESSURE LESS THAN THE PRESSURE EXISTING IN SAID INTERIOR SPACE OF THE VESSEL, THEREBY TO CREATE A PRESSURE DIFFERENTIAL BETWEEN SAID PASSAGE MEANS AND SAID INTERIOR SPACE TENDING TO CAUSE LIQUID AND GASEOUS FLUID FROM SAID INTERIOR SPACE TO SAID PASSAGE MEANS THROUGH SAID PORES, SAID WALL MEANS COMPRISING A MATERIAL WHICH IS WETTED BY SAID LIQUID, THE CROSS-SECITONAL DIMENSION OF SAID PORES BEING SUCH THAT WHEN SAID WALL MEANS IS WETTED BY SAID LIQUID, THE LIQUID ENTERS SAID PORES BY CAPILLARY ACTION TO FORM MEMISCUS INTERFACES EXPOSED TO SAID INTERIOR SPACE ACROSS THE PORES NOT IN DIRECT CONTACT WITH THE LIQUID IN SAID INTERIOR SPACE OF SAID VESSEL AND GASEOUS FLOW FROM SAID INTERIOR SPACE TO SAID PASSAGE MEANS IS RESISTED BY SAID MENISCUS INTERFACES WHEN SAID PRESSURE DIFFERENTIAL IS LESS THAN REQUIRED TO OVERCOME THE SURFACE TENSION OF THE LIQUID AT SAID INTERFACES AND THE ADHESION BETWEEN SAID LIQUID AND THE WALLS OF SAID PORES, AND SAID WALL MEANS BEING ADAPTED TO PASS LIQUID FROM SAID INTERIOR SPACE TO SAID VESSEL TO SAID PASSAGE MEANS THROUGH PORES IN DIRECT CONTACT WITH THE LIQUID IN SAID INTERIOR SPACE.