Re: GPO Key and Lamp units
Often wiring was "preformed" on a jig which allowed the cable fan out to be completed accurately before assembly into the equipment. The individual wires were "dressed" to be straight running and of the correct length. The whole assembly was then laced with waxed lacing twine holding all the wires in the correct positions for terminations.
Where cables were run overhead in large exchanges they were often arranged in a box formation and laced together. The individual cable pairs were then run down the rack side, formed and laced. It was sometimes possible to trace the individual wire colour from the top of the rack to the bottom.
The contractors were meticulous in their workmanship. It was a work of art which usually was never seen.
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