The Evolution of Inductive Loading for Bell System Telephone Facilities

the the contributions of loading the TitHIStheishow story ofcontributions haveitsbeeninductiveWestature.in itInthegrowth of Bell Telephone System to present great particular, tells these made. see in great economic value of organized research, of research scientists and design and development engineers, of manufacturing skill and care, and of the application of sound engineering principles to the design of the telephone plant. The story told here is almost entirely concerned with series inductance coil loading, since other types of loading have had very little use in the Bell System. To make the story more complete, however, a brief account is included of Bell System developments and applications of continuous loading. The main story starts soon after the turn of the century, following the development of the first standard loading coils and loading systems, and carries through to the end of 1949. In the beginning of this period emphasis was placed on urgently needed increases in the range of telephone transmission over open-wire lines and cables, and in the use of cheaper cables.. In this connection it should be remembered that a really satisfactory type 149