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

ARRANGEMENT OF THE WIRE. 121
facility of demagnetizing them when charged with permanent
magnetism.
The attention of the student of telegraphing should be
Fig. 8.
directed to the proper arrangement of the wire around the
cores. The wire should be well insulated, wound as regular
as possible, and in the direction indicated by the preceding
Fig. 9figures. I once knew the working of a station to be hindered
by the operator re-winding his wire, so that the magnetism
could not be imparted to the iron. The arms should be
wound, as represented by fig. 7.