Pressure transducer

Claim 1

A PRESSURE TRANSDUCER COMPRISING A CYLINDRICAL CASING FORMED OF TWO HOLLOW CYLINDRICAL METAL SECTIONS DISPOSED IN END-TO-END RELATIONSHIP WITH AN ELECTRICALLY CONDUCTING DIAPHRAGM DISPOSED THEREBETWEEN, SAID METAL SECTIONS WELDED TO EACH OTHER AND ALSO TO THE EDGE OF SAID DIAPHRAGM TO FORM A PERMANENT INTEGRATED STRUCTURE, SAID DIAPHRAGM HELD UNDER TENSION BY SAID METAL SECTIONS, END MEMBERS ATTACHED TO THE OPPOSITE SIDES OF SAID DIAPHRAGM, SECTIONS, SAID END MEMBERS AND SAID DIAPHRAGM COOPERATING TO DEFINE TWO SEPARATE PRESSURE CHAMBERS IN SAID CASING LOCATED ON OPPOSITE SIDES OF SAID DIAPHRAGM, MEANS FOR ADMITTING FLUID PRESSURE TO EACH CHAMBER, A PAIR OF RINGS EACH SCREWED INTO A DIFFERENT ONE OF SAID METAL SECTIONS, TWO PLATES EACH SECURED TO A SEPARATE RING, EACH PLATE HAVING A DEPRESSION THEREIN FACING SAID DIAHPRAGM, TWO ELECTRODES EACH ATTACHED TO A SEPARATE ONE OF SAID PLATES IN THE DEPRESSION THEREOF, SAID ELECTRODES INSULATED FROM SAID CASING AND SPACED FROM SAID DIAPHRAGM SO AS TO FORM A DIFFERENTIAL CAPACITOR WITH SAID DIAPHRAGM, THE SPACING BETWEEN SAID ELECTRODES AND SAID DIAPHRAGM ADJUSTABLE BY ROTATION OF SAID RINGS, AND MEANS FOR CONNECTING SAID ELECTRODES TO MEANS FOR SENSING CHANGES IN CAPACITANCE OF SAID CAPACITOR RESULTING FROM DEFLECTION OF SAID DIAPHRAGM IN RESPONSE TO A DIFFERENCE IN THE PRESSURES IN SAID TWO PRESSURE CHAMBERS.