Electric-pressure transducers

Claim 1

IN AN ELECTRIC-PRESSURE TRANSDUCER HAVING A TRANSFER LEVER, HAVING PNEUMATIC MEANS INCLUDING A LEAKPORT RESPONSIVE TO MOVEMENT OF SAID TRANSFER LEVER FOR REGULATING THE OUTPUT PRESSURE, HAVING ELECTROMAGNETIC MEANS FOR MOVING SAID TRANSFER LEVER IN A GAP-CLOSING DIRECTION WITH RESPECT TO THE LEAKPORT, AND HAVING PNEUMATIC FEEDBACK MEANS RESPONSIVE TO SAID OUTPUT PRESSURE FOR MOVING SAID TRANSFER LEVER REVERSELY TO ITS FIRST DIRECTION OF MOVEMENT, THE IMPROVEMENT COMPRISING: PROVIDING AN ELECTROMAGNETIC MEANS WHICH INCLUDES A FIXED CORE AND A FIXED COIL AND A MOVABLE ARMATURE WITH THE LATTER SPACED BY A SMALL, VARIABLE, AIR GAP FROM THE END OF THE CORE, A FEEDBACK SPRING INCLUDED IN SAID FEEDBACK MEANS AND POSITIONED TO URGE SAID TRANSFER LEVER IN SAID REVERSE DIRECTION, AND A STABILIZING SPRING ACTING INDEPENDENTLY OF SAID FEEDBACK SPRING, THE SUM OF THE RATES OF SAID FEEDBACK SPRING AND STABILIZING SPRING BEING GREATER THAN THE RATE OF INCREASE OF THE MAGNETIC PULL ON THE MOVABLE ARMATURE RESULTING FROM THE CHANGE IN THE LENGTH OF THE AIR GAP BETWEEN THE ARMATURE AND THE CORE, WHICH MAGNETIC PULL MOVES THE TRANSFER LEVER IN A GAP-CLOSING DIRECTION WITH RESPECT TO THE LEAKPORT, WHEREBY MAXIMUM SENSITIVITY WITH STABILITY RESULTS.