Electron Scattering on Tungsten at 31, 40, and 60 Mev

The cross section for electron scattering by heavy nuclei is model-independent at energies below 60 Mev. The angular distributions of electrons scattered by tungsten at 31, 40, and 60 Mev are self-consistent and give a uniform-model radius equal to $(1.18\mathrm{}\pm 0.10)A^{\frac{1}{3}}\times {10}^{-13\mathrm{}}$ cm.