LEAD-COVERED PAPER-IXSULATED TELEPHONE CABLE 469 



Tape armored cable differs somewhat in construction depending; upon 

 the kind and diameter of cable armored. A typical design is made up 

 as follows: A coating of asphalt is first applied to the cable and over 

 this a layer of impregnated kraft paper. Another layer of asphalt 

 compound is put on and then two servings of impregnated jute roving 



Fig. 39 — ^Wire armoring machine. 



with opposite directions of lay. Asphalt coatings are used between 

 the two servings and on the outside of the second. Next two steel 

 tapes are served with the same direction of lay and with the second 

 tape overlapping the gap between the edges of the first. Again the 

 cable is given a coat of asphalt. One serving of impregnated jute 

 roving, a coating of asphalt and a layer of impregnated jute yarn 

 with opposite direction of lay are next applied. An application of 

 non-adhesive compound composed of whiting, glue, and water com- 

 pletes the armor coating. The machines used for tape armoring are 

 shown by Fig. 40. They consist of a supply position for the lead 

 sheathed cable, asphalt tanks, paper heads, jute heads, two steel 

 tape heads, a capstan and take-up. Tanks for melting the asphalt 

 compounds before their use in the machine are also provided. This 



