公开(公告)号：US3451255A

公开(公告)日：1969-06-24

申请号：US3451255D

申请日：1966-04-07

Applicant: JAMES R NEVILLE ,  IKELS KENNETH G

Inventor： NEVILLE JAMES R ,  IKELS KENNETH G

IPC: G01N30/46 ,  G01N31/08

CPC classification number: G01N30/468 ,  G01N30/466 ,  G01N33/0067

公开(公告)号：US3616681A

公开(公告)日：1971-11-02

申请号：US3616681D

申请日：1969-12-16

Applicant: LEOPOLDO L RODRIGUEZ ,  IKELS KENNETH G ,  JAMES RYAN NEVILLE

Inventor： RODRIGUEZ LEOPOLDO L ,  IKELS KENNETH G ,  NEVILLE JAMES RYAN

IPC: G01N13/02

CPC classification number: G01N13/02

Abstract: AN ELECTRODE SYSTEM IS ATTACHED RELATIVE TO A CAPILLARY TUBE SO THAT AN ELECTRICAL CIRCUIT IS COMPLETED WHEN THE MENISCUS IN THE CAPILLARY TUBVE HOLDING THE SAMPLE FLATTENS OUT AS PRESSURE IS APPLIED BY A MOTOR DRIVEN MICROMETER THROUGH A PRESSURE TRANSDUCER. WHEN THIS OCCURS, THE CONDUCTIVE PROPERTIES OF THE SOLUTION CLOSE A CONDUCTIVITY CIRCUIT WHICH APPLIES A VOLTAGE TO A RECORDER THUS INDICATING THE END POINT. THE PRESSURE NOTED AT THIS POINT IS USED IN THE CALCULATION OF THE SURFACE TENSION OF THE LIQUID SAMPLE.