I remember doing electrical work on many houses that were built in early 1900's. Some 1890's.Started to give it the Amish treatment by cutting the house to garage line & pulled the 1940's(?) fuse boxes. It's amazing how all that wiring didn't burn down either the house or garage. The one splice at the house was between old outdoor 12/2 w/o the bare copper ground to random 12awg wire was done with ground clamps & another in the middle was just bare twists with no covering.
Knob and tube was what was used back then. Many still had gas lighting. I remember disconnecting a 3/8" black pipe cap that still was tied into natural gas. Yikes