Resistance change corrosion probe

Claim 1

A CORROSION PROBE COMPRISING A FIRST, BARE, ELONGATED SPECIMEN OF CIRCULAR CROSS-SECTION FABRICATED OF A CORRODIBLE, ELECTRICALLY CONDUCTIVE METAL, A SECOND ELONGATED SPECIMENT OF RECTANGULAR CROSS-SECTION FABRICATED OF THE SAME METAL AND HAVING TWO OPPOSITE SURFACES, EACH OF GREATER AREA THAN THE REMAINING SURFACES, AT LEAST ONE OF SAID OPPOSITE SURFACES BEING BARE, THE THICKNSS OF SAID SECOND SPECIMEN, DIVIDED BY THE NUMBER OF SAID BARE OPPOSITE SURFACES THEREOF BEING SUCH SO AS TO PROVIDE TO THE RADIUS OF SAID FIRST SPECIMEN A RATIO IN THE RANGE OF 0.74 TO 0.77, MEANS FOR SUPPORTING SAID SPECIMENS FOR EXPOSURE TO A CORROSIVE ENVIRONMENT, AND CONDUCTOR MEANS ELECTRICALLY CONNECTING SAID SPECIMENS AS TWO ADJACENT ARMS OF A WHEATSTONE BRIDGE CIRCUIT HAVING FOUR ARMS SERIALLY CONNECTED IN CLOSED CIRCUIT TO PROVIDE FOUR JUNCTURES, A RESISTANCE AND A VARIABLE RESISTANCE CONNECTED AS THE REMAINING ARMS OF SAID BRIDGE CIRCUIT, SAID VARIABLE RESISTANCE BEING IN THE ARM ADJACENT TO SAID FIRST SPECIMEN, A POTENTIAL SOURCE CONNECTED ACROSS TWO OPPOSITE JUNCTURES OF SAID BRIDGE, AND POTENTIALSENSING MEANS CONNECTED ACROSS THE REMAINING JUNCTURES.