Concentric copper cable
Concentric copper cable, multiple insulation, lead sheathed wire armoured Fowler-Waring laid in Exeter 1893
Two samples Fowler-Waring Concentric cable for 2200-volt operation, laid in 1892
Concentric copper cable, multiple insulation, lead sheathed wire armoured Fowler-Waring laid in Exeter 1893
Concentric copper cable, insulation lead sheathed, double iron tube armoured and hemp sheathed