Hydraulic mechanism including pilot control responsive to atmospheric conditions

Claim 1

HYDRAULICALLY POWERED MEANS IN ASSOCIATION WITH AN EXISTING HYDRAULIC PRESSURE SOURCE FOR PROVIDING RECIPROCATING MOTION RESPONSIVE TO TEMPERATURE COMPRISING A PISTON HAVING FIRST AND SECOND EFFECTIVE PRESSURE AREAS WITH THE FIRST AREA BEING GREATER THAN THE SECOND, A TWOPOSITION CONTROL VALVE, THE SECOND AREA AND THE INLET OF THE CONTROL VALVE BEING IN CONTINUOUS COMMUNICATION WITH THE PRESSURE SOURCE, VARIABLE-CENTROID BALANCE MEANS OPERATING THE CONTROL VALVE AGAINST VALVE INLET PRESSURE, DUCT MEANS CONNECTED FROM THE CONTROL VALVE FOR SUPPLYING WATER AT A PREDETERMINED RATE TO THE BALANCE MEANS WHEN THE CONTROL VALVE IS IN ONE VALVE POSITION FOR VARYING THE CENTROID OF THE BALANCE MEANS TO CAUSE THE BALANCE MEANS TO MOVE FROM A FIRST ONE OF TWO STABLE POSITIONS IN WHICH THE CONTROL VALVE IS IN SAID ONE POSITION TO THE SECOND OF SAID TWO STABLE POSITIONS, THE CONTROL VALVE RESPONDING TO MOVEMENT OF THE BALANCE MEANS FROM THE FIRST TO THE SECOND STABLE POSITION THEREOF TO MOVE TO A SECOND VALVE POSITION TO PROVIDE COMMUNICATION BETWEEN THE PISTON FIRST AREA AND THE PRESSURE SOURCE FOR RECIPROCATION OF THE PISTON BY UNBALANCED HYDRAULIC PRESSURE FORCES ON THE FIRST AND SECOND AREAS, THE BALANCE MEANS IN THE SECOND STABLE POSITION BEING RESPONSIVE TO REMOVAL OF MOISTURE FROM THE BALANCE MEANS TO UNBALANCE SAME FOR MOVEMENT THEREOF TOWARD THE FIRST OF SAID TWO STABLE POSITIONS, MOVEMENT OF THE BALANCE MEANS FROM THE SECOND TO THE FIRST OF SAID STABLE POSITIONS EFFECTING MOVEMENT OF THE CONTROL VALVE FROM THE SECOND TO SAID ONE VALVE POSITION, AND SELF-ADJUSTING TEMPERATURE ACTUATED MEANS DIRECTLY OPERABLE AGAINST THE BALANCE MEANS FOR GOVERNING THE MOTION OF THE BALANCE MEANS FROM THE SECOND TO THE FIRST STABLE POSITIONS THEREOF.