Nice graphic Donnie.
I just worked on that very same circuit today.
It's important to remember that this was a legal circuit at the beginning of the 1900s. Polarization of the lampholder happened about 15 - 20 years into the century. Putting the switch in the neutral was stopped about the same time.
A lot of dwellings were built with code compliant original installations that get grandfathered in now, even though the circuit is recognized as hazardous now.
