The Uses of Wireless Telegraphy
47
fhat the harbor of destination was ice-bound. A short message by wireless would halt the steamer, thereby saving much coal and other expense.
22. Telegraphing over Land
While greater distances may be covered by wireless telegraph over water, as was explained in Art. 5, it is also
Fig. 23.—Portable Signal Corps U. S. A, Outfit “On the March.”
used to a considerable extent in telegraphing over land. While as yet it has not entered into very active competition with the regular wire service, it fills a great demand in communicating over wild countries, where the installation and maintenance of a regular telegraph or telephone line would be impracticable. It is also much cheaper
