The telegraph manual: a complete history and description of the semaphoric, electric and magnetic telegraphs of Europe, Asia, Africa, and America, ancient and modern.

320 SEIMENS AND HALSKIE S GERMANIC TELEGRAPH.
main at rest; E E E' E' are the electro-magnets of the indicators, and of the bell apparatus, and G G' are two electrometers, placed in the circuit in the drawing. The station 2, at
Fig. 5.
the left, speaks and transmits signals to the station 1, at the
right. The course followed by the current is indicated by the
line wires and the station connections.
To place the commutators in contact with T M', it is sufficient to press the button b, fig. 5.
The needles of the two indicators move constantly over the
dials; and to transmit signals, it is only necessary to stop
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dials; and to transmit signaals, it is only necessary to stop