Pulp Insulation for Telephone Cables

PULP INSULATION FOR TELEPHONE CABLES 3 have demonstrated that it compares favorably in stability and permanence with the well established manila fibre. In the case of pulp insulated cable which is discussed in this paper the raw material used is 100 per cent of this wood fibre. The present day ribbon paper insulating machine as developed by the Western Electric Company is essentially a rotatable hollow tapered spindle centrally mounted on and integral with a light weight disc about 15 inches in diameter. The wire to be insulated passes through Fig. 1--Ribbon paper insulators.