Methods of Minimizing Lead Loss in Emissivity and Resistivity Determinations

Two means are described for minimizing the effects of lead loss in determining the electrical properties of thin filaments as a function of temperature. In both cases the filaments are supported at the mid‐points of filamentary U's. In one case the U's are made of finer wire than the main filament so that lead loss is reduced. In the other case, alternating current is passed through the U's so that the temperature of the main filament is maintained uniform down to its points of support.