DIELECTRIC PROPERTIES OF INSULATING MATERIALS 669 



2. E. V. Schweidler, " Die Anomalien der dielektrischen Erscheinungen," ibid., p. 232 ; 



Ann. d. Phys. (4) 24, 711 (1907). 



3. J. B. Whitehead, "Lectures on Dielectric Theory and Insulation," McGraw-Hill 



(1927). 



4. L. Hartshorn, Jour. I. E. E., 64, 1152 (1926). 



5. P. Debye, "Polar Molecules," Chem. Cat. Co., New York (1929). 



6. Schering's "Die Isolierstoffe der Elektrotechnik," Springer, Berlin (1924). 



7. A. Gemant, "Die Elektrophysik der Isolierstofife," Berlin (1930). 



