SECTION B 



MEANS OF COMMUNICATION 



CHAPTER XXI 

 THE TELEGRAPH 



1 . What are the essential parts of a telegraph sys- 

 tem ? how do they work ? 



2. How does the wireless telegraph differ from the 

 ordinary telegraph ? 



Use of the telegraph in daily life. There are many won- 

 derful machines, very important in our daily lives, to which 

 we have become so accustomed that we hardly realize what 

 they do for us. This is true of the telegraph. Let us stop 

 for a moment to see how much we owe to this wonderful 

 little instrument. We are apt to think of the telegraph only 

 in connection with bringing the sad news of the death or 

 sickness of a friend or relative. But this is only an occasional 

 use. We receive the benefit of the telegraph every day of 

 our lives, many times unconsciously. 



Newspapers. Each day the newspaper brings to our 

 doors news which has been flashed from every part of the 

 world by the telegraph. We were able to follow the hap- 

 penings of the great war in Europe from day to day, and to 

 receive the news of a battle only a few hours after it was 

 fought. When President Wilson makes a speech in any 

 part of the United States or Europe, the next day's papers 

 give the entire speech to all parts of the country. As one 



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