A Determination of the Melting Points of Tantalum And Tungsten
A Determination of the Melting Points of Tantalum And Tungsten
William Elmer Forsythe
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Several times the same lamp was calibrated from the gold point ' Mendenhall, Physical Review^ 33, 74, 191 1. Digitized by Google 364 WILLIAM E: FORSYTHE (1063° C.) and from the palladium point, which gave a chance to compare the palladium point with the gold point. As an average of several determinations of the palladium pomt by extrapolation from the gold point we obtained 1548° C, while an extrapolation down from the palladium point gave 1063° C. for the gold point. As a test of the furnace a...nd the pyrometer a determination of the melting-point of platinum was made. As it was known that platinum would react with carbon vapor at high temperatures, the platinum was inclosed in small magnesium tubes. The platinum gave, when it broke, all evidence of fusion, the ends being globular and small bright masses of platinum being scattered all along the lower end of the tube. Table III gives the results for the work on platinum in the graphite tube furnace. For the work in the furnace Baker platinum was used and the melting-point of this compared with that of Heraeus by the method of Mendenhall and Ingersoll.^ The two specimens were melted on a Nernst glower and from their values for the constants of the glower the difference in temperature was calculated.
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