POST FOR WIRES. 



Fi 



which are in the ground being charred and tarred. The manner 

 of treatment, however, varies in different countries. 



53. In figs. 10 and 11 are 

 represented different forms of 

 supports used in England. 

 To cross-pieces of wood, A A', 

 bolted upon the post (fig. 10), 

 are attached balls, 6, of stone- 

 ware, as described above, in 

 which grooves or slits are 

 formed to receive and support 

 the wires. These supports 

 are protected from rain and 

 from the deposition of dew by 

 hoods of zinc-coated iron 

 placed over them. Glass being 

 so much better an insulator, 

 balls of that material are re- 

 cently being substituted for 

 the stoneware. 



Another form of support, 

 sheltered by a sort of sloping roof, is represented in fig. 11. On the front 

 of the post is a wooden arm to which a series of stone-ware rings are 



attached, through which the wires pass. These rings have the form 

 of two truncated cones placed with their larger bases in contact. 



It is usual, where the wires are numerous, as on some of the 

 lines near London, to attach these supports both to the front and 



137 



