Instrument for measuring electrical conductivity of test solutions

Claim 1

AN INSTRUMENT FOR MEASURING THE ELECTRICAL CONDUCTIVITY OF A TEST SOLUTION COMPRISING A CELL HAVING AN INSULATING TUBE OPEN AT BOTH ENDS, AND ELECTRODE HERMETICALLY-SEALED TO EACH END OF THE TUBE, SAID TUBE AND ELECTRODES FORMING A CELL RESERVOIR FOR CONTAINING A TEST SOLUTION, AND INLET PORT EXTENDING THROUGH ONE ELECTRODE FOR INTRODUCTION OF THE TEST SOLUTION INTO THE CELL RESERVOIR, AND AN OUTLET PORT EXTENDING THROUGH THE OTHER ELECTRODE FOR DISCHARGE OF THE TEST SOLUTION, SAID OUTLET PORT BEING AT A HIGHER ELEVATION THAN SAID INLET PORT AND TAPERING UPWARDLY TO FACILITATE THE ESCAPE OF AIR BUBBLES DURING THE FILLING OF THE CELL RESERVOIR, A SECOND CELL OF SIMILAR STRUCTURE AS THE AFOREDESCRIBED FIRST CELL AND IN WHICH A STANDARD SOLUTION AGAINST WHICH THE TEST SOLUTION IS TO BE MEASURED IS INTRODUCED, AND UPWARDLY-EXTENDING DRAINPIPE OPEN AT BOTH ENDS AND CONNECTED BETWEEN ITS ENDS WITH THE OUTLET PORTS OF BOTH CELLS, THROUGH WHICH OVERFLOW TEST AND STANDARD SOLUTIONS WILL RESPECTIVELY FLOW, A SUCTION PUMP CONNECTED TO THE UPPER END OF SAID DRAINPIPE, A HERMETI-