1882.] 



on Electric Bailicaijs. 



71 



better. For this purpose we lead the guttapercha, or indiarubber, 

 covered wire coming from the main cable through the centre of a 

 specially formed telegraph insulator, and cause it to adhere to the 



Fig. 1. 



inside of the earthenware tube forming the stalk. And as, in addition, 

 the inside of each contact box is dry, a very perfect insulation is 

 maintained for the lead coming from the main cable. Consequently 

 as all leakage is eliminated except in the immediate neighbourhood 



Fig. 2. 



of the train, this system can be employed for the very longest electric 

 railways. Fig. 2 shows a modification of the contact box when the 

 insulated rail instead of extending all along the line is quite short 



