Rubber insulating can be applied to the copper wires either by squirting the compound round the cable as in cab tyre sheath, or by passing wire between two sheets of rubber through a roller and pressing the edges together, or by wrapping rubber tape round the wire spirally.
The cylinders of rubber sheet are cut into.sections by revolving knives. The various sections are then separated. Every inch of the rubber tape for insulating purposes is examined before using.
The rubber insulation is protected by one or more layers of tape which should have the manufacturer's name and sometimes the grade of the wire printed on it for identification purposes.
Having covered the wire with the requisite rubber and tape, it is now necessary to vulcanize the insulation in order that it. may become a good wearing composition. For this the cable must be wound on drums of large diameter and steamed in cylinders. After removal the cable must be rewound into coils for the purpose of passing through subsequent processes of manufacture.
Text read from the printed page and cleaned; old type leaves the occasional error.