Heat Conduction in Liquid Helium
IT was found by Rollin and by Keesom and Keesom that liquid helium II shows an extraordinarily high heat conductivity, of the order of 190 cal./deg.cm.sec. We have measured the heat conductivity with the following method, which is essentially a combination of a vapour-pressure thermometer with a liquid-helium manometer. (The method was developed in discussion with Dr. J. D. Cockroft.) An evacuated…