. The Encyclopaedia Britannica; ... A dictionary of arts, sciences and general literature . ther jack-cord connectingthat conductor to the terminal of the other line. Thus differentswitch boards may be looked upon as separate ex-hanges, connectedtogether by a number of ti-unk wires after the manner describedbelow. In a large system it is much more convenient and economical tohave exchanges in the various districts, and connect these with acentral exchange by a sufficient number of trunk lines, A eub-seriber in one district wishing to speak to a subscriber in anothercalls the exchange in his ow
. The Encyclopaedia Britannica; ... A dictionary of arts, sciences and general literature . ther jack-cord connectingthat conductor to the terminal of the other line. Thus differentswitch boards may be looked upon as separate ex-hanges, connectedtogether by a number of ti-unk wires after the manner describedbelow. In a large system it is much more convenient and economical tohave exchanges in the various districts, and connect these with acentral exchange by a sufficient number of trunk lines, A eub-seriber in one district wishing to speak to a subscriber in anothercalls the exchange in his own district and is put in communicationby the attendant stationed there with the central exchange. Theattendant at the central exchange puts the subscriber in communi-cation with the district he recjuires, and the attendant there callsthe other subscriber and joins the two subscribers lines some cases neighbouring district exchanges have, besides a com-mon means of communication through the central exchange, anindependent connexion. These arrangements are diagrammatically \l-.
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