Abstract
On the basis of extensive measurements made on the distribution of temperature, and on the distribution of other physical characteristics which are known functions of the temperature, along tungsten filaments heated in vacuo, several empirical formulae have been proposed by Worthing, and they have found wide practical application. Many of these formulae are shown in the present part to follow naturally from the theoretical expressions deduced in parts I and II, as special cases. The conditions for their validity also get determined. The other formulae of Worthing are shown to be good approximations, and the degrees of their closeness to the corresponding theoretical formulae are estimated.
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