Method and apparatus for measuring capacitivity of materials

Claim 1

A CAPACITOR TEST CELL ADAPTED TO RECEIVE QUANTITIES OF DIELECTRIC SUBSTANCE OF DIFFERENT DENSITIES AND TO BE COUPLED INTO A MEASUREMENT SYSTEM, COMPRISING A FIRST CONDUCTIVE ELECTRODE OF CIRCULAR CONFIGURATION, A SECOND HOLLOW CONDUCTIVE ELECTRODE HAVING SUBSTANTIALLY CYLINDRICAL INNER SURFACES, A SUBSTANTIALLY FLAT CONDUCTIVE COVER PLATE MOUNTED FOR CLOSURE AND REMOVAL FROM ONE END OF SAID HOLLOW ELECTRODE, MEANS SUPPORTING SAID CIRCULAR ELECTRODE WITHIN SAID HOLLOW ELECTRODE IN AN INSULATED RELATION THERETO WITH CONDUCTIVE SURFACES OF SAID FIRST ELECTRODE AND COVER PLATE AND SAID CYLINDRICAL INNER SURFACES BORDERING A SUBSTANTIALLY CYLINDRICAL SPACE LARGER THAN THAT OCCUPIED BY SAID QUANTITIES OF DIELECTRIC SUBSTANCE, CONDUCTIVE SURFACES OF SAID FIRST ELECTRODE BORDERING SAID SPACE BEING SMALLER THAN THE COMBINED INNER CONDUCTIVE SURFACES OF SAID HOLLOW ELECTRODE AND THE CONDUCTIVE SURFACE OF SAID COVER PLATE, WHEREBY GENERATED ELECTRIC FIELD FLUX IS CONCENTRATED IN THE VICINITY OF SAID CIRCULAR ELECTRODE AND DIVERGES TOWARD SAID CYLINDRICAL INNER SURFACES