[HayZee518]

I worked for a contractor back in 1965 and we ran into several houses with the 3/8" pipe for gas lights. I can only remember one house that the gas line was still active. The box is a cast iron box with clamps for the knob and tube type wire. The center knock out was removed allowing the pipe to come through, the box is fastened to a stud or a board with a hole in it. the pipe goes through the board and box into an elbow in the ceiling joist space above the plate. I can't figure out why a contractor would use a box with a gas pipe IF the gas fixture was alive. Maybe the box was an after thought when the knob and tube was installed. the "hickey" was used with the electric fixture and 1/8th inch pipe because the pullchain part was also 1/8th inch and just screwed together. the wires were fixture wires - cotton over jute or rubber and just fit through the 1/8th inch pipe. splices were made to the knob n tube in the box and an escutheon plate was put over this.