Gauge for liquid storage tanks

Claim 1

A GAUGE FOR LIQUID STORAGE TANKS COMPRISING, A STORAGE TANK HAVING AN UPWARDLY OPENING FILLING NECK, A CAP REMOVABLY MOUNTED ON AND NORMALLY CLOSING SAID NECK, A GUIDE SLEEVE EXTENDING THROUGH AND SECURED IN SAID CAP SUBSTANTIALLY PARALLEL TO THE AXIS OF THE CAP AND THE FILLING NECK ENGAGED THEREBY, A RIGID TUBE EXTENDING SLIDABLY THROUGH SAID GUIDE SLEEVE HAVING AN OPEN LOWER END DISPOSED WITHIN THE TANK AND AN OPEN UPPER END DISPOSED ABOVE THE GUIDE SLEEVE AND CAP AND EXTERNALLY OF THE TANK, AN INFLATABLE FLOAT HAVING A NECK PORTION DISPOSED AROUND AND SECURED TO THE LOWER END OF SAID TUBE, SAID FLOAT WHEN COLLAPSED BEING INSERTABLE THROUGH THE FILLING NECK OPENING INTO THE TANK, SAID FLOAT BEING INFLATABLE WITHIN THE TANK BY AIR UNDER PRESSURE SUPPLIED TO THE FLOAT THROUGH THE TUBE FROM THE UPPER END THEREOF, AND MEANS FOR SEALING THE BORE OF THE TUBE TO PREVENT THE PASSAGE OF AIR THERETHROUGH TO MAINTAIN THE FLOAT INFLATED TO A LARGER SIZE AS MEASURED TRANSVERSELY OF THE TUBE THAN THE DIAMETER OF THE FILLING NECK, AND A WEIGHT SUPPORTED ON SAID TUBE.