Automatic on and off control system for gas plants

Claim 1

IN A GAS SUPPLY SYSTEM, THE COMBINATION COMPRISING A VARIABLE VOLUME GAS HOLDER NORMALLY SUPPLIED FROM A PRIMARY GAS SOURCE, SAID GAS HOLDER INCLUDING A TOP SECTION MOVABLE VERTICALLY WITH CHANGES IN THE VOLUME OF GAS CONTAINED THEREIN, A FIRST CONDUIT CONNECTING A SUPPLEMENTARY GAS SUPPLY TO SAID HOLDER, A FIRST CONTROLED VALVE IN SAID FIRST CONDUIT, A SECOND CONDUIT CONNECTING A SUPPLEMENTARY GAS SUPPLY TO SAID HOLDER, A SECOND CONTROL VALVE IN SAID SECOND CONDUIT, A FIRST PULLEY MOUNTED ADJACENT SAID GAS HOLDER, A CABLE CARRIED BY SAID PULLEY, A PIVOTED MEMBER CARRIED BY SAID CABLE AND ADAPTED TO ASSUME A FIRST POSITION UPON MOVEMENT OF SAID CABLE IN ONE DIRECTION AND A SECOND POSITION UPON MOVEMENT OF SAID CABLE IN THE OPPOSITE DIRECTION, A SECOND PULLEY MOUNTED ADJACENT SAID GAS HOLDER, A CABLE CARRIED BY SAID SECOND PULLEY A PIVOTED MEMBER CARRIED BY SAID SECOND CABLE AND ADAPTED TO ASSUME A FIRST POSITION UPON MOVEMENT OF SAID CABLE IN ONE DIRETION AND A SECOND POSITION UPON MOVEMENT OF SAID CABLE IN THE OPPOSITE DIRECTION, MEANS CARRIED BY THE MOVABLE SECTION OF SAID GAS HOLDER ADAPTED TO CAUSE MOVEMENT OF SAID FIRST CABLE IN ONE DIRECTION UPON DOWNWARD MOVEMENT OF SAID GAS HOLDER TO A PREDETERMINED POINT AND ADAPTED TO CAUSE MOVEMENT OF SAID SECOND CABLE IN THE SAME DIRECTION UPON FURTHER DOWNWARD MOVEMENT OF SAID GAS HOLDER, SAID LAST MEANS ALSO ADAPTED TO CAUSE SIMULTANEOUS MOVEMENT OF SAID CABLES IN THE OPPOSITE DIRECTION UPON MOVEMENT OF SAID MOVABLE SECTION TO THE FULL POSITION OF SAID GAS HOLDER, AND VALVE ACTUATING MEANS RESPONSIVE TO THE POSITIONS OF SAID PIVOTED MEMBERS WHEREBY SAID CONTROL VALVES ARE OPENED UPON MOVEMENT OF SAID PIVOTED MEMBERS TO SAID FIRST POSITIONS AND CLOSED UPON MOVEMENT OF SAID PIVOTED MEMBERS TO SAID SECOND POSITION.