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A transient instrument with a liquid metal in‐glass probe to measure the thermal conductivity of high‐temperature melts has been developed. A wire heat source in the conventional hot‐wire method was replaced by a mercury thread contained in a glass capillary. This modification has made it possible to apply the transient method to electrically conducting liquids at high temperature. Satisfactory results were obtained for HTS (Heat Transfer Salt) in the temperature range 457–580 K.