Slip tube gauge

Claim 1

A SLIP TUBE GAUGE FOR A PRESSURE TANK COMPRISING A BASE SEALINGLY ATTACHED TO THE TANK ABOUT AN OPENING THEREINTO, AN AXIALLY SHIFTABLE TUBE EXTENDING VERTICALLY THROUGH SAID BASE AND OPENING INTO SAID TANK, PACKING MEANS IN SAID BASE ABOUT SAID TUBE, A CAGE SURMOUNTING SAID BASE, A TUBE LATCH LEVER PIVOTALLY MOUNTED IN SAID CAGE AND HAVING A HOLE INTERMEDIATE ITS ENDS THROUGH WHICH SAID TUBE EXTENDS, SAID LATCH LEVER IN ONE POSITION FREELY PASSING AND ON RELATIVE UPWARD TILTING LOCKING SAID TUBE AGAINST UPWARD MOVEMENT, SPRING MEANS FOR NORMALLY HOLDING SAID LATCH LEVER IN TUBE-LOCKING POSITION, POINTER MEANS CARRIED BY SAID CAGE FOR READING A GRADUATED SCALE ON SAID TUBE, UPPER AND LOWER VALVE MEANS CARRIED BY SAID TUBE RESPECTIVELY WITHIN SAID TANK AND ABOVE SAID CAGE, SAID LOWER VALVE MEANS BEING SPRINGLOADED FOR NORMALLY CLOSING AN INTAKE PORT TO SAID TUBE, SAID UPPER VALVE MEANS INCLUDING A SEAT AND A VALVE STEM ROTATABLE AND SHIFTABLE WITHIN LIMITS RELATIVE TO SAID SEAT, ROD MEANS EXTENDING LOOSELY THROUGH SAID TUBE AND OPERATIVELY CONNECTED TO AND SHIFTABLE VERTICALLY ON ROTATION OF SAID STEM AT A LIMIT OF MOVEMENT THEREOF AWAY FROM SAID SEAT FOR OPENING AND CONTROLLING CLOSING OF SAID LOWER VALVE, A HOUSING SUPPORT CARRIED BY SAID BASE BELOW SAID TUBE LATCH, A REMOVABLE HOUSING, SAID HOUSING INCLUDING A COVER SEATABLE ON SAID SUPPORT FOR ENCLOSING THEREWITH OPERATING PARTS OF SAID GAUGE THEREABOVE, LOCKING MEANS CARRIED BY SAID COVER AND SHIFTABLE TRANSVERSELY THEREOF INTO AND OUT OF LOCKING ENGAGEMENT WITH SAID SUPPORT, AND ACTUATING MEANS CARRIED BY AND SHIFTABLE VERTICALLY RELATIVE TO SAID COVER FOR LOCKING AND RELEASING SAID LOCKING MEANS.