PRESSES FOR THE MANUFACTURE OF LEAD AND ALUMINUM CABLE SHEATHING

PRESSES FOR THE MANUFACTURE OF LEAD AND ALUMINUM CABLE SHEATHING 

In Germany the first lead cables were provided by Werner Siemens ) as long ago as 1851 for the fire-alarm network of the City of 

Borchardt, H., u. S. V. Weiher 75 Jahre Kabelwerk Berlin. Siemens-Schuckertwerke AG 1951. 

Berlin. These cables consisted of a gutta-percha covered conductor threaded into a lead pipe, the diameter of which was subsequently reduced by cold drawing until the pipe fitted tightly around the cable core. Three decades had to pass until in 1882 there was used a press, constructed by Werner von Siemens, on which the lead sheath was directly extruded on to the cable core. 

Despite its many drawbacks the lead sheath has found widest application in the course of the decades up to the present time to protect the cable core against the entry of liquids and vapors and - frequently in connection with a suitable reinforcing - against mechanical stresses. In some special cases the sheath served as grounding wire or neutral conductor, too. 

---