RECENT CONTRIBUTIONS TO ELECTRIC WAVE 
TELEGRA PHY. 
187 JEON, dip NG Idina WE J. IDS S655 JOG IRS Si, ile URS 
Pender Professor of Electrical Engineering in the University of London. 
The achievements and possibilities of wireless telegraphy have not 
yet ceased to interest the public mind. In less than ten years from 
the practical inception of that form of it conducted by electric waves, 
it has developed into an implement of immense importance in naval 
warfare and maneuvers. It has provided a means of communication 
between ship and shore which has added greatly to the safety of life 
and property at sea. It has so far altered the conditions of ocean 
travel that great passenger liners, separated by vast distances on 
stormy seas, speak to each other through the ether with far-reaching 
voices, and are never out of touch with land during the whole of 
their voyage from port to port. 
You are doubtless aware that it is now the usual thing for an 
Atlantic liner, equipped with long distance receivers, to be in com- 
munication with either the Marconi stations at Poldhu in England 
or Clifden in Ireland, and that at Cape Cod in the United States 
throughout the voyage, and at the same time to exchange messages 
not only with the other shore stations when passing, but with a score 
or so of sister vessels during the journey.’ 
On board many of the Cunard liners small daily newspapers are 
published containing the latest news of the day sent by wireless 
telegraphy from both coasts. 
Every important navy in the world has now adopted it in some 
form as an indispensable means of communication. In our own navy, 
@ Paper read before the Royal Institution of Great Britain at its weekly even- 
ing meeting, Friday, May 24, 1907. Reprinted, by permission, from the Transac- 
tions of the Royal Institution. 
6’ The Cunard liner Lucania, which arrived March 18, 1907, at Liverpool from 
New York, reported that she was, when in mid-Atlantic, in communication by 
wireless telegraphy with Poldhu, in Cornwall, and Cape Cod, in the United 
States, at the same time. During the voyage she spoke with thirty-two North 
Atlantic steamers, and with twenty-four of these she had wireless communi- 
cation. 
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