Radiation from transmission lines

The problem of radiation losses from transmission lines on which high-frequency currents are transmitted has become of considerable practical interest in view of the fact that in carrier wave transmission over wires, frequencies are now employed which are comparable with those utilized in radio communication. In discussing this problem I shall confine myself to a brief examination of two particular questions, the answers to which are, I believe, sufficient for engineering purposes, although they by no means constitute a complete solution of the problem.