There was a box wired onto the bracket between the legs of the treadle. My DS stopped by and was looking at it. He wanted to plug it in to see if it worked. I showed him the box that I took off. I noticed some wire coiled in it like springs...or heating coils. He says it looks like a small ceramic heater. It has an outlet in the cord to plug a motor and a light into it. I found out my machine is a model 127, and was manufactured in Elizabeth, NJ on March 4, 1919. They told me i can download a free copy of the instruction manual at www.singerco.com