The history and progress of the electric telegrpah by Sabine Robert

Author:Sabine, Robert. [from old catalog]
Language: eng
Format: epub
Tags: Telegraph
Publisher: London, Virtue & co.; New York, Virtue and Yorston
Published: 1869-03-25T05:00:00+00:00

Fig. TO.

magnetism in the soft-iron cores, from continued currents in one direction, should interfere with their delicacy.

The currents transmitted from the station towards i* 1 , by pressing down the key k 1 , take the direction from l b, copper pole c, front contact and lever of key, first bar of commutator

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it, g 1 , and l 1 . The operations with apparatus 2 and l 3 are similar.

Whon the contact peg is put in one of the holes 8 or 4, the apparatus on the opposite side to that in which the peg is pat in is ready for participating in any messages that may be passing through the line in either direction. Suppose the peg to be inserted in the hole 8. The currents' coming from the direction l 1 go then from l 1 , through g 1 , peg 8 of the commutator o 2 , coils of relay on the right, back contact of x 3 , lever x 2 , commutator u, o 2 , l 3 , &c. The relay r 3 will be set in action and work the Morse m ,j , which will print all the signals passing from the line i* 1 into the line l 3 .

98. Commutator for Stations with three or four Lines from different directions. —Where more than twp lines from different directions meet at a station, it is required to employ a commutator by which, whilst one or two lines are being corresponded with, the remainder can be connected up, two and two, for circular correspondence.

When three lines meet at a station, a commutator, arranged by Borggreve, is usually employed, by which any two of the lines may be connected together in circuit with a galvano-scope, or complete recording apparatus, while the third line is open for telegraphic communication from the same station as terminal.

When four lines meet, it is necessary to arrange the commutator so that, upon occasion, they may be connected up two and two with intervening receiving apparatus, by which the corresponding stations are in direct communication, and the intermediate stations able, at the same time, to participate in the information transmitted.

Fig. 70, a, gives a plan of connections of Borggreve's commutator for three lines, by which the following combinations are possible:—

1. Li circular with Ln, Lai with apparatus.

2. Li „ „ Lin, Ln » » 8. Ln „ „ Lin, Li „ ,,

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THE ELECTRIC TELEGRAPH.

In using this commutator three of the holes are always stoppered at the same time. Fig. 70, b, gives the position of the stoppers in the holes answering to the positions 1, 2, and 8, above.

Circular JjfaredUi

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