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 SIGNAL ALPHABET. 267
batteries. One of the signal wires, with its battery, is used as
a common wire for the other two. Hence the current of the
two batteries of the two signal wires unite in one, and are connected with the battery of the common wire as a compound
battery.
In the following table, the first column represents the keys,
which, when depressed, produce a deflection of the needles,
represented in the second, third, and fourth columns, by means
of their batteries, and thus closing the circuit of the wires,
12 3 4 5 and 6, by which the fluid is made to pass through
the prepared fabric, and mark upon its space, or spaces, numbered 1 2 3 4 5 and 6, in the fifth column. In the sixth column are the letters which the marks upon the fabric are
intended to represent.
Keys. Needles. Needles. Needles. Spaces on Fabric. Letters,
H 7, AT, - - 1, A
J 7, A S, - 2, B
K 7, B T, - - 3, C
7, B S, - - 4, D
0 7, T - - 5, E
U 7, C, - - 6, F
H K 7, AT B T, - 13, GJ M 7, A S, B, - 24, H
K 0 7, B T, C T, - 35,
MU 7, B S, C, - 46, J
H 0 7, A T, C T, - 15, K
J U 7, A S, C S, - 26, L
H M, AT, B S, 1 4, A
J K, A S, B T, 2 3, N
K U, B T, C S, - 3 6,
M O B S, C T, - 45, P
H U, A T, C S, - 16, Q
J O, A S, C T - 25, R
H K 0 7, A T, B T, C T, 3 5, S
J M U 7, AS, B' S, C S, 246, T
H KU, AT, BT, CS, 136, U
J M 0, AS, B S, C T 2 4 5, V
H I U, AT, B S, S, 14 6, W
J K U, AS, B T, CS, 236, X
H O, AT, B S, CT, 4 5, Y
J KO, AS, BT, CT, 234, Z
The patent of Mr. Davy embraces the following claims,
which will be found to be very important, in regard to the