Thermodynamic Temperature Scale Derived from Measurements of ${}_{}{}^3{}_{}{}^{}\mathrm{He}$ Latent Heat

The latent heat of ${}_{}{}^3{}_{}{}^{}\mathrm{He}$ has been measured along the melting curve from 23 to 1 mK. With these results an absolute temperature scale is established which depends only on measurements of heat, volume, and pressure and the assumption that the entropy of solid ${}_{}{}^3{}_{}{}^{}\mathrm{He}$ approaches $R\ln 2$ at high temperatures.