Pressure transducers

Claim 1

IN A TRANSDUCER OPERATIVE TO CHANGE THE RESISTANCE IN A CIRCUIT IN PROPORTION TO A CHANGE IN PRESSURE, A RIGID NON-CONDUCTIVE PANEL, A BANK OF PAIRS OF SPACED TERMINALS ON THE PANEL ARRANGED IN SERIES TO ADD TO OR REMOVE RESISTANCES FROM THE CIRCUIT, A PIN FIXED TO THE PANEL PERPENDICULAR TO SAID PANEL, A RIGID BRUSH ARM, SPACED PERFORATED EARS AT ONE END OF THE ARM PIVOTALLY MOUNTING THE ARM ON THE PIN WITH ONE SIDE SUBSTANTIALLY PARALLEL TO THE PANEL A PAIR OF UPSTANDING EARS AT SAID ONE SIDE OF THE ARM NEAR ITS DISTAL, END AN INSULATOR SECURED TO THE EARS SUBSTANTIALLY PARALLEL TO THE PANEL, A PAIR OF ELASTICALLY RESILIENT BRUSH WIRES SECURED TO THE INSULATION, SAID BRUSH WIRES PROJECTING FROM THE INSULATION DOWNWARDLY AND INWARDLY INTO YIELDING CONTACT WITH THE BANK OF TERMINALS, FOR SLIDING MOVEMENT OF THE BRUSHES ALONG THE BANK OF TERMINALS, A COILED SPRING MOUNTED ON THE PIN OPERATING ON THE ARM TO BIAS IT IN ONE DIRECTION, A PAIR OF SPACED LIMIT PINS FIXED TO THE FACE OF THE PANEL, AND A LUG PROJECTING INWARDLY FROM THE ARM FROM BETWEEN THE EARS OPERABLE, BY ENGAGEMENT WITH THE PINS, TO LIMIT MOVEMENT OF THE ARM BEYOND A PREDETERMINED POSITION IN EITHER DIRECTION OF ITS MOVEMENT ALONG THE BANK OF TERMINALS.