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

300 SINGLE POINTER TELEGRAPH.
be employed, there is wire only where there is magnetism in
the magnet to be acted on. This latter arrangement, therefore,
enables all superfluous resistance in the circuit to be dispensed
wRith; and hence the same amount of electric power is enabled
to produce a far greater effect on the distant telegraphic instruments, or less power to produce an equal effect. Currents of
electricity from secondary batteries were to be employed where
great mechanical effects were desired at the distant station.
An instrument was devised for this purpose, called a " perenode."
The next patent was taken out by Mr. Edward Higihtbn on
the 7th February, 1850.
Fig. 3.
Do Not
Understand Understand
A- 33 1 E
B. 1131 3 -T
C- 311 11.0
D.133 13 -N
E. 1 31 -I
F- 313 3 33.A
-. 1133 111.S
H11 113 113.H
I-31 131.U
J- 3133 133.D
K- 1331 311 -C
L. 331 313.F
M. 1113 CD 331 -L
N, 13 333 3
0- 11 1111.P
P- 1111 1113.3
Q- 1313 1131.B
1. 333 1133 G.
S- 111 1311 V
T. 3 1313 -Q
U- 131 1331 -K
V. ~-lL 1:'303-3W'" 1333 3111 -Y
X- 3113 3113 -X
Y.3111 3131 -Z
Z-. 3131 3133.J
to Numbers 3311 3311 to Numbers
to Pri. Sigs. 33 13 33 to Priv. Sigs.
Repeat......3331 3331......Repeat
Wait.......3333 3333........Wait
Code.......1 ong og.....Code
Letters.....3 o 3*.....3Letters,
Single-pointer telegraph for one line-wire, with code shown on dial. The pointer is
moved to the right or left by the horseshoe magnet and coil.