2 story, 73 years old, walk up attic. Bare wire that spirals from gable end to gable end and attached at each end with lag screws. One end leads down to the attic wall, passes through a ceramic insulator and disappears from view into the wall cavity. No knob & tube in the house.
I felt like a fool when the client asked what the wire was and I didn’t have an answer. I responded that I would find the answer and let him know.
First to answer wins the ‘Feel Good About Your Knowlege Award’