CHAPTER IX. HIGH-FREQUENCY CONDUCTORS. 403 80. Effect of the frequency on the constants of a conductor. 403 81. Thermal resistance and radiation resistance, internal and external reactance, as functions of the frequency. 405 82. Total impedance of high frequency conductor, and its components, discussion. 407 83. Example of copper and iron wire, copper ribbon and iron pipe ; tabulation and discussion of numerical values. 408 84. Continued discussion of results. • 409 85. Potential drop in conductors carrying high frequency currents. Tabulation. Effect of conductor shape and material. 412 CONTENTS. SECTION IV. TRANSIENTS IN TIME AND SPACE. PAGE