The plan of the work is simple, and the arrangement orderly
and proper. A concise statement is given of the fundamental principles
of electricity, and of the means of its artificial propagation. This
includes, of course, a description of the various batteries used in
telegraphing. Then follows a chapter upon electro-magnetism and its
application to the telegraph. This prepares the way for a statement
of the physical conditions under which the electrical current may be
conveyed. The author then describes the instruments necessary for the
transmission and recording of intelligible signs, under which general
head of "Electric Telegraph Apparatus" the various telegraphic systems
are made the subject of careful description. A chapter is given to the
history of each system,--the Morse, the Needle, the House, the Bain, the
Hughes, the Combination, and others of less note. These chapters are
very complete and very interesting, embodying, as they do, the history
of each instrument, the details of its use, and a statement of its
capabilities. The system most used in America is the Combination
system, the printing instrument of which is the result of an ingenious
combination of the most desirable qualities of the House and Hughes
systems.
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