ELECTRIC TELEGRAPHS. 



411 



or shorter time, a dash or a dot is produced at the station to which 

 the signal is sent. The dash and dot are combined in different ways 

 to indicate the different letters, as shown in the following scheme, 

 which is now generally adopted both in Europe and America : 



A- 

 I- 



B - 



C - 

 D - 

 E- 



E 



F 



G 



H --- 

 I-- 



1 



2. 



3 



4- 



5- 



6 



1 



8 



9 







A space about equal to the length of a dash is left between two letters 

 and a space of about twice this length between two words. 



In needle-telegraphs, the dot is represented by a deflection to the 

 left, and the dash by a deflection to the right. 



Fig. 12 represents Morse's indicator in connection with what is 



Fig. 12. 



Earth 



Morse's Apparatus, -with Relay. 



called a relay ; that is to say, an apparatus which, on receiving a fee- 

 ble current from a distance, sends on a much stronger current from a 

 battery on the spot. The key (B) being up, a current arriving by the 

 line-wire passes through the key from c to a, thence through another 



