April 1900 in Hill Street…
“On Monday afternoon, the 9th inst., there slowly emerged from the mouth of an underground pipe in Hill-street, Birmingham the last length of the new underground telegraph cable-about 120 miles in length-from London to Birmingham,
The jointing of the lengths drawn in during the last few weeks will take some days, and the date of the inaugural opening ceremony of the new service has yet to be fixed. The work was begun in March, 1897, and has therefore taken a little over three years. The cable consists of seventy-six copper wires, the insulating material used being paper. Grants for the cable to the amount of £150,000 have been made by the Treasury. A lead casing of 2.5 in. diameter is employed, and the cable is drawn into 3in. iron piping, laid about 2.5ft. below the surface of the ground. At intervals of five miles the wires are brought to the surface and passed through examining chambers.”
(The Engineer, April 1900)