Reproduced by permission of Messrs. Siemens Bros., Ltd. 



SECTIONS OF ARMOURED CABLES FOR THE CONVEYANCE OF 

 ELECTRIC CURRENT UNDERGROUND 



The conductors, of tinned copper wires stranded together, are insulated 

 with waxed paper or rubber tape, jute soaked in tarry compounds, vulcan- 

 ised bitumen, or other substances. A sheathing of lead, which appears in 

 the illustration as a continuous white ring about J.-g in. wide, is added by 

 passing the cable through a lead press which squeezes out the lead round it 

 as a continuous shell. This effectively keeps out moisture, but, being 

 easily damaged, is protected outside by jute wrappings and an armour of 

 galvanised iron wires (top) or interlocking steel tape (bottom), which is 

 again covered with a serving of jute. 



