HISTORY AND PROGRESS. 



151 



fore held on the insulated contacts. On breaking the line 

 circuit at any point, the local circuits are closed, and the 

 current of B goes through the coils of the printing instru- 

 ments, which are set in action. 



For translation, the arms of the switches are shifted to 



Fig. 83. 



the spring terminals T ; the circulating current then takes 

 its way through L', R', K and T (of switch), over to the other 

 side, beam of Morse I/, D, line battery L B, earth, &c. The 

 current of L B goes also to the Morse on the other side, 

 switch T, K', relay R 2 , and line L 2 . 



