Thanks for the answers last week on knob and tube now I have more. This K&T system I am replacing seems to form a loop, that is it encircles the entire attic then attaches back to itself. Was this standard practice in 1903? It's not too easy to see it all since someone buried it in 2 feet of rock wool! I've been doing a lot of digging.
Also I was curious if anyone knows when houses were first wired with bladed receptacles. It appears this house originally just had Edison sockets in the ceilings- you can see where receptacles were added later by splicing BX onto the K&T with those funny looking things the older guys call "monkey faces".
Sorry for all the questions- I haven't had the opportunity to do any residential K&T replacements before and I am facinated by it.
