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

328 FRENCH TELEGRAPH-RECEIVING APPARATUS.
is movable around two screws, one of which is visible at Ar.
The rod of the armature N P, is terminated at the upper
part by a horizontal point, engaged in a fork. The axis
bearing this fork, and the escapement anchor, are retained by
the screw a-the disposition analogous to fig, 3.
Fig. 3.
The clock-work is contained between two copper plates.
The axis of the last wheel m c, bears the exterior needle D.
c E, and the escapement-wheel furnished with 4 teeth, concealed in the figure by a rod of the armature. The two
screws x and y limit the extent of the motion of the rod of the
pallet.
The recoil spring is fixed at u to the rod N P, it is terminated
by a wire passing in the hooks v and s, and is wound upon the
little pulley T, the axis of which is prolonged as far as F.
L, figures 1 and 2, is a rod bent at L/", which serves to give
direct motion to the armature. The wires of the electro-magnets terminate at two little buttons, which, by means of metallic strips, communicate with the exterior of knobs A and B.
The movement of the apparatus is the same as the dial-plate
apparatus.
When the current traverses the wire of the electro-magnet,
the armature is attracted, the rods set in motion the little fork
and escapement anchor, which suffers a single tooth of the
wheel to pass, and during the movement the needle turns through
an angle 450. When the current ceases to pass, the armature
returns to its first position, and the needle turns again 45~.
The needle, therefore, produces a series of angles of 450;
from 00 up to 360~.