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

348 THE FRENCH TELEGRAPH BELL INSTRUMENTS.
P'. in a state of rest, is vertical, and presses against the spring
Q, q' q.
The circle h, fig. 1, which turns with the eccentric H, bears
a little rod, which it moves on turning in the direction indicated by the arrow, and which hits against the portions q' q of
the spring Q q q' which is wider at q' q than Q q'.
Fig. 2.
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In the position of the figures, the rod r being stopped, the rotation of the axis h and G, in fig. 3, cannot take place. When
a current arrives from one of the exterior screw or binding-posts,
in traversing the wire of the electro-magnet, the armature Wi'
A, fig. 2, is attracted, and M' n' m withdraws a little, and the
strip P, o/ m, descending under the action of the spring o' o, fig.
2, causes the axis P, fig. 3, to turn a little. The quoin pr, fig. 1,
inclines toward the left, and draws back the spring q q' Q. The
rod r is not stopped, and the wheel h, fig. 1, turns as well as the
eccentric G, fig. 1, of which the bent part engages with the spring
0 0 O 0~~,swihth prn