Thermal Conductivity of Lead and of Single and Poly Crystal Zinc

The thermal conductivities of lead and of single and poly crystal zinc over the temperature range -250^∘{}C to +100^∘{}C determined by a method previously described by Bidwell are reported upon. The thermal conductivity increases for these metals as the temperature is lowered but shows no extraordinary increase at extreme low temperatures as was found for lithium. The single crystal zinc shows about 18 percent better thermal conductivity than the poly crystal sample. A zinc sample cast in open air showed about 7 percent poorer conductivity than a sample prepared in vacuo. The data are in agreement with the law k/aC=K/T+K^'.