The True Temperature Scale of Carbon

Spectral emissive power of Acheson graphite at 0.660{μ}.---The spectral emissive power of Acheson graphite for the wave-length 0.660{μ} has been determined for the temperature range from 1250^∘{}K to 2700^∘{}K. The observations were made on a small tubular graphite resistance furnace with a hole in the wall and are best summarized by the relation: ε=0.984-5.8×10^-5T. Measurements of the temperature distribution along the furnace afford determinations of the ratio of resistivity to thermal conductivity at three temperatures.