Altitude controller

Claim 1

A CONTROLLER; SAID CONTROLLER COMPRISING A PRESSURE MEASURING MECHANISM FOR CONVERTING PRESSURE CHANGE INTO AN OUTPUT MECHANICAL MOTION, A TRANSDUCER MEANS FOR CONVERTING MECHANICAL MOTION INTO AN ELECTRICAL SIGNAL AND A CLUTCH; SAID CLUTCH HAVING AN INPUT MEMBER AND AN OUTPUT MEMBER CONNECTED TO ONE ANOTHER THROUGH A CLUTCHING MEDIUM AND A STOP MEANS FOR LIMITING THE MOTION OF SAID OUTPUT MEMBER; SAID CLUTCHING MEDIUM BEING CONSTRUCTED TO TRANSMIT ONLY A RELATIVELY SMALL TORQUE OF A PREDETERMINED CONTROLLED VALUE AND TO THEREAFTER SLIP; SAID INPUT MEMBER OF SAID CLUTCH BEING OPERATIVELY CONNECTED TO SAID PRESSURE MEASURING MECHANISM TO HAVE SAID OUTPUT MECHANICAL MOTION OF SAID PRESSURE MEASURING MECHANISM APPLIED THERETO; SAID OUTPUT MEMBER OF SAID CLUTCH BEING OPERATIVELY CONNECTED TO SAID TRANSDUCER MEANS AND SUPPLYING MECHANICAL MOTION THERETO TO BE CONVERTED TO AN ELECTRICAL SIGNAL; SAID TRANSDUCER GENERATING AN ELECTRICAL SIGNAL RESPONSIVE TO PRESSURE CHANGE MEASURED BY SAID PRESSURE SENSING MECHANISM; A PRESSURE CHANGE BEYOND SOME PREDETERMINED VALUE CAUSING THE APPLICATION OF A TORQUE BEYOND SAID PREDETERMINED TORQUE CAPACITY OF SAID CLUTCH TO BE REACHED WHEREBY SAID INPUT MEMBER OF SAID CLUTCH CONTINUES TO ROTATE INDEPENDENTLY OF SAID OUTPUT MEMBER AND SAID TRANSDUCER; SAID CLUTCH MEDIUM INCLUDING A PERMANENT MAGNET, A FRICTION MEMBER CARRIED BY ONE OF SAID INPUT OR OUTPUT MEMBERS AND A MAGNETIC MEMBER CARRIED BY THE OTHER OF SAID INPUT OR OUTPUT MEMBERS; SAID PERMANENT MAGNET BEING POSITIONED WITH RESPECT TO SAID MAGNETIC MEMBER TO DRIVE SAID MAGNETIC MEMBER INTO ENGAGEMENT WITH SAID FRICTION MEMBER TO HOLD SAID MEMBERS IN ENGAGEMENT WITH A RELATIVELY LOW, CLOSELY CONTROLLED TORQUE.