Telephone transmission over long cable circuits

James J. Pilliod: Metallic conductors interconnecting cities and territories must be used in ever increasing quantities to meet the requirements for long distance telephone service. For many conditions, open wires carried on pole lines provide the best method and t he one with which we are all generally familiar. The other available method and the one with which this paper specifically deals, is to bunch the wires together within the limits of a small lead sheath and this, as might well be supposed, introduces new problems and some of the most important of these are problems of transmission. The two methods mentioned are complementary and both have wide fields of application.