Thermal conductivity cell apparatus

Claim 1

IN A THERMAL CONDUCTIVITY CELL HAVING A METAL BLOCK OF HIGH HEAT TRANSFER CAPACITY, A SHALLOW CYLINDRICAL CHAMBER EXTENDING INWARDLY OF ONE FACE OF SAID BLOCK AND CLOSED AT ITS INNER END, A FIRST CONDUIT COMMUNICATING WITH SAID CHAMBER AT SUBSTANTIALLY THE MID-POINT OF ITS DEPTH, A SECOND CONDUIT COMMUNICATING WITH SAID CHAMBER AT SUBSTANTIALLY THE SAME DEPTH AS SAID FIRST CONDUIT, THE OUTLET OF SAID FIRST CONDUIT AND THE INLET OF SAID SECOND CONDUIT BEING SUBSTANTIALLY IN AXIAL ALIGNMENT, A REMOVABLE CLOSURE ACROSS THE OUTER OPEN END OF SAID CHAMBER, A HOT WIRE SENSING ELEMENT HAVING ONE END SUPPORTED BY SAID CLOSURE AND ELECTRICALLY INSULATED THEREFROM, SAID HOT WIRE SENSING ELEMENT BEING BXIALLY ALIGNED WITH SAID CHAMBER AND NORMAL TO THE FLOW OF A SAMPLE STREAM, IMPERFORATE COLUMNAR FLOW BARRIER MEANS CARRIED BY SAID CLOSURE AND EXTENDING SUBSTANTIALLY TO THE INNER CLOSED END OF SAID CHAMBER, SAID BARRIER MEANS BEING ARRANGED SYMMETRICALLY IN TANDEM BETWEEN SAID FIRST AND SECOND CONDUITS AND