MANUFACTURING LEAD-COVERED TELEPHONE CABLE 337 



The pressure for operating these presses is furnished by a hydrauHc 

 pump, pumping water at six thousand pounds pressure per square 



Fig. 13 — Electric tractor and trailer for handling cable reels. 



inch. Presses were formerly connected to four plunger vertical type 

 pumps, but it was found that more water could be used with the large 



Fig. 14 — Insulating machines 



sizes of cable and, therefore, new pumps were built with six plungers, 

 giving a proportionally greater output. The diameter of the lead ram 

 22 



