The application of negative-impedance repeaters on long rural telephone lines

Present-day expansion of telephone service is at peak levels with no immediate end in sight, and benefiting by this expansion is an important segment of the United States ¿ the rural area. Questions may be asked, ¿What´s new about this?¿ or, ¿Rural telephones have been with us for years, so why the fuss?¿ True, there is nothing new in the concept of rural telephone service, but the present demand is at such levels that serious problems are presented to the telephone industry. The economic problem is one of real significance, but it is not discussed here. It is proposed to discuss, rather, the transmission aspects involved in extending this service to these areas.