152 THE ELECTRIC TELEGRAPH. 



When the line L' is interrupted anywhere, the temporary 

 magnetism disappears from the cores of the relay bobbins 

 the armature falls off against its reposing contact, and the 

 left side of the local circuit with Morse M is closed. The 

 depression of the printing beam separates the contact spring 

 from the screw point, by which the line L" is also interrupted ; 

 and armature of the relay R 2 falls against its reposing 

 current. 



On the deflection of the beam G of Morse M, the contact 

 with H having been broken, the local circuit is interrupted ; 

 and, notwithstanding the action of the relay R', the Morse M' 

 does not move. 



Thus, in translating, both relays are in motion, but only 

 one Morse apparatus that on the side from which the 

 message comes. 



Sometimes another method of translation is adopted, by 

 which the messages arriving at an intermediate station by a 

 line with continuous current, are translated into aline worked 

 by intermittent currents, and vice versd. This is often found 

 useful in shunting despatches between lines already arranged 

 with different systems. 



Fig. 84 gives a plan of connections for this operation, in 

 which the single parts of the apparatus on the right-hand 

 side are the same as in Fig. 83. Those on the -left-hand side 

 are supplied with the additional contacts of the switch and 

 Morse. The line battery is divided in halves. 



It is supposed that Line I. on the left, L, is worked by con- 

 tinuous, and Line II. on the right, by intermittent currents. 



For station work, the continuous current circulating in 

 Line I. (R, switch, 2, s, K 1, 2, L B, &c.) and Earth is interrupted. 

 The armature of R then goes from the insulated to the working 

 contact, and closes the local circuit by which the Morse M is 

 moved. On the other side, the currents arriving go from 

 Line II. (switch 2, s, K', 1, 2, R' E) to earth, and close the 

 other local circuit setting M' in motion. To transmit a 

 message from either side, the arm 2 of each of the switches 

 rests on s, and the keys K and K are simply manipulated. 



In translation, the arms of the switches rest on the ter- 



