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This is a picture of the fitting that would fit on the end of a piece of BX wire. You would seperate the phase wire from the neutral wire and it acted just like a weatherhead on the end of a service cable. Then you would attach your phase wire to a knob and tube (K&T) phase leg and solder it, wrap it with rubber tape, then with friction tape.

This shows a K&T switch that has an ON/OFF window so that you can see if the switch was on or off. This switch could also be used on BX wiring. It usually mounted on a 3" or 4" round box. The back plates were different. It was usually mounted in basements, tops of basement stairs, etc. It wasn't very decorative.

Surface Switch; It mounted on the wall and the K&T wiring would pass through this round switch. This particular switch was for a high, med, and low application.

- Harold Endean