A Modification of Lees\u27 Method for the Determination of the Heat Conductivity of a Poor Heat Conductor

Lees\u27 Method is described at length in the Phil. Trons. An 1898, vol. 191, also in a general way in Poynting and Thompson\u27s Heat and Watson\u27s Textbook of Physics. The modified method is described in detail in The Measurement of the Heat Conductivity of Sulfur and a Sulfur-Coke Mixture, Physics Thesis by Paul C. Overstreet, State University of Iowa, 1925. This method consists of the measuring of the temperatures of a hot copper disk, U, on one side of a poor heat conducting disk, S, and that of a cooler disk, M, on the other side of S, after the system has come to a steady state - heat being furnished to U as described in Lees\u27 Experiment