Telegraph, Magneto-electric.
A telegraph in which the current is produced by magneto-electric
generators. It has been applied to a considerable extent in England. The
Wheatstone ABC or dial telegraph is operated by a magneto-generator
turned by hand.
In this country the magneto-electric generator by which the calling bell
of a telephone is rung is an example. The magneto-electric key (See Key,
Magneto-electric) is for use in one kind of magneto-electric
telegraphing.
Telegraph, Morse.
A telegraph, characterized by the use of a relay, working a local
circuit, which circuit contains a sounder, or recorder for giving dot
and dash signals constituting the Morse alphabet. The signals are sent
by a telegraph key, which when depressed closes the circuit, and when
released opens it. The two underlying conceptions of the Morse Telegraph
system are the use of the dot and dash alphabet, and the use of the
local circuit, which circuit includes a receiving instrument, and is
worked by a relay, actuating a local battery. It would be difficult to
indicate any invention in telegraphy which has had such far-reaching
consequences as the one known as the Morse telegraph.
In other places the principal apparatus of the system will be found
described. The cut Fig. 318, repeated here gives the general disposition
of a Morse system. (See Circuit, Local.)
Fig. 318. DIAGRAM OF MORSE SYSTEM.