File:American telephone practice (1905) (14733377126).jpg

Identifier: americantelepho00mill (find matches)
Title: American telephone practice
Year: 1905 (1900s)
Authors: Miller, Kempster B. (from old catalog)
Subjects:
Publisher:
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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Text Appearing Before Image:
the lines, and allconductors from the switch-board apparatus are wired in a per-manent manner to the various connectors or clips on the respectiveportions of the distributing frame. The gap between the terminalsof any pair of wires on the line portion of a distributing frame, andthose of the corresponding pair leading from the switch-boardapparatus, is filled by means of bridle or jumper wires, the latterterm being the most commonly used. The distributing board is soarranged that the jumper wires may lead from any pair of con-nectors on the line portion to any pair on the switch-board portion,and if the distributing frame is a good one these jumper wiresmay be led with perfect order and may be changed as often asdesired. In Fig. 447 is shown a distributing board, which is, happily, arelic of the past, but which, in its day, was distinctly superior to.others, and may be said to have served its purpose well. It is ofinterest here from a historical standpoint. This picture was taken 612
Text Appearing After Image:
FIG. 417.—OLD ST. LOUIS DISTRIBUTING FRAME,613 614 AMERICAN TELEPHONE PRACTICE. from the inside of the distributing frame, which was in the formof a hollow square, one corner of which is shown. It accommodatedabout 4,000 lines entering the old office of the Bell Telephone Com-pany, at the corner of Fourth and Pine streets, in St. Louis, Mo.The lines were practically all aerial and were brought to a largetower at the top of the central office building; they were then leddown in cables, shown in the picture, these cables being fanned outfor attachment to the clips on the upper portion of the frame. Inthe same manner the switch-board cables were led up to the lowerset of clips on the distributing board shown at the bottom of the

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