An all-metal concentric cylinder type of thermal conductivity cell was designed, fabricated, and calibrated to measure the thermal conductivity of forty natural and synthetic base lubricating fluids.nThermal conductivity values in the temperature range of from 70 to 500°F are reported for fluids considered stable to the higher temperature. The maximum tem¬peratures for other fluids were limited by their instabilities under test conditions. Since each fluid has individual characteristics, no correlation of conductivity val¬ues appears possible. Values are considered precise and for possible correlation can be compared to those of a fluid chosen as a "standard reference."
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