This paper describes an apparatus for the rapid measurement of thermal conductivity of liquids in the temperature range from 150 to 250# and in the pressure range up to 25.0MPa. A small bead-in-glass thermistor was used as a sensitive element. The thermistor probe

which is in a circuit with a bridge

was immersed in liquid under investigation. When a heating current was passed through the thermistor

the dV/dt of the bridge was measured. The thermal conductivity of the liquid under investigation λ could be calculated with the equation λ=A-B dV/dt

where A and B are instrument constants determined by the data of standard liquids. The time of meassuring dV/dt was 1.5seconds. The apparatus was calibrated by using six standard liquids at "different temperatures and pressures

the average deviation of measurements was within±2%. The apparatus is capable of not only measuring organic liquids

but also measuring electrolytic liquilds or solution.