Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 746
itches with the wipers of the corresponding selector.By this means a much more positive action of the various switches issecured, as there are fewer of them to be operated in multiple, andbesides this a better talking circuit is aiiforded. The switch room of the Citizens Telephone Company, of… … FIG. E20.-SWITCH ROOM IN GRAND RAPIDS AUTOMATIC EXCHANGE. rack, these occupying the first four rows. Above these are mountedthe corresponding second selectors and connectors, these occupyingthe upper two rows. All cabling is done on iron racks overhead, inmuch the same manner as is practiced in the…
Telephone
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