Conservator for oil-filled transformer

Claim 1

A CONSERVATOR FOR OIL IMMERSED TRANSFORMERS COMPRISING A HOUSING, A GAS-TIGHT EXPANSIBLE CELL LOCATED WITHIN SAID HOUSING AND HAVING A FLAT TOP WALL AND A LOWER PORTION SECURED TO THE BOTTOM OF SAID HOUSING, CONDUIT MEANS FOR CONNECTING THE INTERIOR OF SAID CELL TO A TRANSFORMER FOR RECEIVING AND DELIVERING TRANSFORMER INSULATING OIL, PRESSURE BALANCING OIL IN SAID HOUSING IN A QUANTITY OF IMMERSE SAID CELL IN SAID BALANCING OIL AND TO LEAVE AN AIR SPACE IN SAID HOUSING ABOVE THE LEVEL OF SAID BALANCING OIL, MEANS CONNECTING THE AIR SPACE ABOVE SAID BALANCING OIL IN SAID HOUSING TO THE ATMOSPHERE, A TOP PLATE SUPERIMPOSED ON SAID CELL FLAT TOP WALL AND COVERING SAID WALL AND HAVING A DOWNWARDLY PERIPHERAL EDGE COVERING AND UPPER PERIPHERAL EDGE OF SAID CELL AND BEING AFFIXED ALONG SAID DOWNWARDLY TURNED EDGE TO SAID CELL, SAID HOUSING AND SAID CELL BEING OF A SIZE SUCH THAT THE UPPER SURFACE OF SAID TOP PLATE MOVES APPROXIMATELY IN THE SAME LEVEL WITH THE SAID BALANCING OIL DURING OPERATION OF THE TRANSFORMER.