Belgium 



99 



trunks to that of existing pole lines. As a fact, the three 

 Brussels-Paris trunks follow different routes for a considerable 

 portion of the way. If placed alongside each other on a cross- 

 arm and crossed every kilometer at the same places, all three 

 would have been got on the same poles and been equally effective. 



FIG. 30. Dimensions in millimeters. 



As it is, the speaking between Brussels and Paris is practically 

 perfect. 



The same twisting plan was originally employed on other 

 trunks, but has since been discontinued, the simple horizontal 

 crossing introduced by the author on the Dundee- Arbroath trunk 

 line in 1884 being found equally effective. The non-use of cross- 

 arms on telegraph poles in Belgium, as in other continental 



H 2 



