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In general, melting points of subs tances are determided using quasi steady-state techniques, where the specime n is ei ther heated or cooled very slowly until a phase cha nge is detec ted. These methods present difficulties at high temperatures (above 2000 K) due to increased heat transfer, che mical reactions , evaporation , loss of mechanical strength , e tc. In ord er to overcome most of these diffic ulties experiments may be performed in short tim es by heating the specimen rapidly to its melting point. A technique utilizing this approach was described in the li terature [l].1 The specime n was of tubular form (100 mm long, 6.4 mm outside diameter , 0.5 mm wall thickness) with a small hole in the wall at the middle of the specime n. The cylindrical specimen approximated blackbody conditions for optical (pyrometric) temperature measurements. The specimen was heated from room temperature to its melting point in less than one second by the passage of a high current (2000 A) through it. The maximum te mperature attained was the melting point. The melting point obtained by this me thod was reproducible within 1 K (standard deviation of the mean). The tubular specimen had to be des troyed during each determination. The cost and difficulty of fabri cati ng specimens used in the above s tudy make it unsuitable for ge neral use. The objective of thi s note is to describe a highspeed method of measuring melting point of electrical conductors (with melting points above 2000 K) where the specimens are in the form of thin wires. The method is based on de tecting melting of a specimen which is wound around a tube as the latter is heated rapidly in vacuum. The limitation of the measureme nts to te mperatures above approximately 2000 K is im-

A pulse heating method for the measurement of melting point of electrical conductors (thin wires) above 2000 K