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

THE AXIAL MAGNET. 395
between the depression of two different keys or the repetition
of the depression of the same one; the object of the composing
machine is to rapidly break and close the circuit as many
times as there are spaces from any given letter to the next
one which it is desired to transmit, counting in alphabetical
order.
THE AXIAL MAGNET.
The rapid electrical pulsations are transmitted by the circuit
of conductors to the magnet and printing machine at another
station, through the wire J, fig. 1. The helix of this magnet
is an intensity coil contained in the steel cylinder A, fig. 1,
on the upper surface of the mahogany case; its axis is
vertical.
A, fig. 4, is a brass tube, eight or ten inches long, placed
within the helix, and
fastened at the bottom Fig. 4.
by the screw D. To the
inner surface of this tube
are soldered six or eight Isoft iron tubes, separated
from each other at regu-,
lar intervals. Above the
iron cylinder is an ellip- 22 I
tical ring F, through the J 0 ~ B M
axis of which is ex- - =
tended an elastic wire, G;
two screws are attached
to the wire, by which it
is made lax or tense, to
suit the intensity of the
electric current. From e__ I E
this is suspended the
brass rod c, that passes
down within the small
iron tubes before mentioned, and has strung
on it six or eight small
iron tubes L; these are
fastened at equal intervals, and have their lower
extremity expanded into N
a bell-like flanch; the
surrounding fixed ones
have their upper ends D