GB521801A - Improvements in or relating to electric communication cables - Google Patents

Abstract

521,801. Loaded conductors. STANDARD TELEPHONES & CABLES, Ltd., BAGULEY, E., VEZEY, J. R., HUGHES., R. L. and DALZELL, D. P. Nov. 24, 1938, No. 34167. [Class 36] An electric communication cable includes a conductor with two or more layers of loading material applied helically and spaced apart from one another by non-magnetic and non-conducting material; the layers may have alternate directions of lay, or in a cable including a screened or unscreened pair or quad each conductor may have layers with the same direction of lay and in registration with one another. The inner layer may be similarly spaced from the conductor. The spacing material may comprise tapes of paper or other fibrous material which may be esterified or impregnated with polymerised material, or of cellulose acetate, polystyrene or other thermoplastic or organic insulating material ; alternatively, spacing may be effected by continuous layers of insulating material, such as polystyrene, which is sprayed, painted or extruded. Where such a loaded conductor is surrounded by a spaced co-axial outer conductor, the space between the outer layer of loading material and the outer conductor may be filled with thermoplastic insulation such as paragutta, or the conductors may be spaced by discs, helical spacers &c. of insulating material leaving air spaces. Specifications 457,280 and 521,712 are referred to.