Item ST 9074 Cable Sample - Submarine Telegraph, Intermediate, Date Unknown

Summary

Section of an intermediate submarine telegraph cable. The central conductor is surrounded by insulation, brass tape , more insulation, armouring wires, and an outer protective covering.

Intermediate cable was inserted between the less-protected and lighter deep-sea cable and the more heavily protected shore-end cable.

Physical Description

The central conductor is a strand of 7 copper wires. It is insulated with gutta percha or vulcanized rubber and protected by a wrapping of brass tape. The brass is covered with more insulation and wrapped with armouring wires. The armouring wires are covered by an outer protective coating.