Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 635
res 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 o*ne 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,… … FIG. 447.-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…
Telephone
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