The experiment did not
succeed quite so well in salt water. Professor Trowbridge then mentioned a
method which he had suggested some years ago for telegraphing across the
ocean without a cable, the method having been suggested more for its
interest than with any idea of its ever being put in practice. A conductor
is supposed to be laid from Labrador to Patagonia, ending in the ocean at
those points, and passing through New York, where a dynamo machine is
supposed to be included in the circuit. In Europe a line is to extend from
the north of Scotland to the south of Spain, making connections with the
ocean at those points, and in this circuit is to be included a telephone.
Then any change in the strength of the current in the American line would
produce a corresponding change in current in the European line; and thus
signals could be transmitted. Mr. Preece, of the English postal telegraph,
then gave an account of how such a system had actually been put into
practice in telegraphing between the Isle of Wight and Southampton during
a suspension in the action of the regular cable communication. The
instruments used were a telephone in one circuit, and in the other about
twenty-five Leclanche cells and an interrupter.
Pages:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25